FR2602391A1 - POWER PROGRAMMER OF A NETWORK OF LIGHTING LAMPS - Google Patents

Abstract

THE PRESENT INVENTION CONCERNS THE FIELD OF PUBLIC LIGHTING OR WORKSHOPS. IT CONCERNS IN PARTICULAR A DEVICE THE FUNCTION OF WHICH IS TO VARY THE POWER OF A NETWORK OF ELECTRIC LIGHTS AS A FUNCTION OF CONTROL PARAMETERS SUCH AS THE TIME OR THE EXTERNAL LUMINOSITY AND TO PROVIDE THE NETWORK WITH MAXIMUM POWER AT THE MOMENT OF THE 'TURNING ON THE NETWORK IN ORDER TO ALLOW THE LAMPS TO REACH THEIR OPERATING RATE, WHETHER THE VALUES OF THE ENTRY PARAMETER ARE.

Description

The present invention relates to a power variation system in

  an electric circuit comprising one or more electric lamps. The purpose of this device is to vary the lighting power according to parameters such as time or external brightness. It is intended in particular to control a public lighting network or a lighting network in workshops. Devices are known for varying the power of lamps using electromechanical dimmers such as

  rheostats or toroidal transformers. There are also known O10 electronic dimmers using triacs.

  These devices have a certain number of disadvantages: the electromechanical drives can have in certain cases a low efficiency and be generating electromagnetic interference. In addition, they require a complex servo motor system to react to external parameters. On the other hand, electronic drives are sensitive to mains disturbances, in particular to overvoltages that can

appear during a storm.

  But, in addition to the disadvantages mentioned above, the known devices

  not suitable for certain types of lamps requiring mandatory maximum power on ignition.

  This is particularly the case for some metal vapor type lamps such as sodium lamps or mercury lamps stabilized by standard equipment.

  The present invention aims to remedy this drawback by ensuring maximum power on the network at the time of ignition and for a period of time sufficient for the lamps to reach their operating speed and this regardless of the values of the

servo settings.

  The present invention has many other advantages. In particular, the device according to the invention is very little sensitive to disturbances of the network, does not create electromagnetic interference and has

  a good return. In addition, being made with standard components, it is low cost and highly reliable.

  Other advantages and features will emerge more clearly

  reading of the description which follows and which sets forth a particular embodiment given by way of indication and not limitation.

  Figure 1 shows a block diagram of the device.

  The device comprises two electromagnetic inverters (1) and

2602.39 1

  -2 (2) and two inverters (3) and (4) controlled by a clock and an injector transformer (5) and a timer (6), a period equal to the time required for lamps to reach their regime 5-10 seconds for choke tube lamps and about 1 minute for high pressure sodium (SHP) lamps and mercury lamps. The injector (5) consists of a transformer whose secondary winding (7) is inserted into the phase of the lighting network and

  whose primary winding (8) has several taps.

  When the primary winding is short-circuited, the network

  is powered & its maximum power.

  This occurs when the coil (9) of the electromagnetic inverter (2) is excited and closes the contact (10).

  The coil (9) is controlled by the timer (6). When the network is turned on, the timer (6) makes a fugitive contact between the point (11) and the phase. This contact is maintained for an adjustable duration and determined by the characteristics of the lamps used on the lighting network. It can be fixed as

  for example at 120 seconds for lamps of the SHP type.

  After this time, the timer returns to its rest position

  and ensures a contact between the phase and the point (12).

  The point (12) is further connected to the inverter (4) which can

  be controlled by a mechanical or electronic clock.

  This inverter (4) supplies the coil (13) or the coil (9) of the electromagnetic inverter (2> according to its position.

  When the coil (9) is exerted, the secondary winding of the injector (5) is short-circuited and the network is powered to its maximum power. When the coil (13) is energized, the power available on the network can take two values depending on the state of the inverter (3). This inverter (3) can also be controlled by a pendulum feeds the coil (14) or (15) of the electromagnetic inverter (1). When the coil (14) is energized, the intermediate tap of the injector is energized and when the coil (15) is energized, the end tap (16) of the injector (5) is energized. It is thus possible to vary the power of the lighting network according to the state of the inverters (3) and (4) according to the following table: - 3 - Power in Inverter (4) Inverter (3) the network the Network Position A Minimum Position C Position B Intermediate Position A Position D Maximum Position B This table is of course valid only when the timer is in the rest position (12). When the timer (6) is in working position (11), the power available on the lighting network is maximum regardless of the positions of the inverters

(3 and 4).

  In what follows, we will give some non-limiting examples

variants.

  According to a first variant, the device may comprise an injector having several intermediate taps.

  It is thus possible to adjust the intermediate powers and

of the lighting network.

  According to a second variant, a second injector is inserted between the electromagnetic inverter (1) and the electromagnetic inverter (2).

  This second injector makes it possible to finely adjust the minimum and intermediate values.

  According to another variant, one of the inverters (3, 4) or both,

  can be controlled by devices sensitive to external lighting.

  By way of example, in the case of workshop lighting, the inverter (4) may consist of a photoelectric cell controlling an electromagnetic or electronic relay whose tripping threshold will correspond to the fall of the day. The inverter (3) may also consist of a photoelectric cell controlling a relay whose triggering threshold will correspond to a higher brightness, in order to modulate

  lighting according to the outdoor brightness.

- 4

  Another variant consists in replacing the electromagnetic inverters (1) and (2) by three-phase inverters in order to control a three-phase network.

  Many other embodiments can be envisaged without departing from the scope of the present invention. -.5

Claims (9)

  1) power variation system in an electrical circuit comprising at least one electric lamp, characterized in that it comprises means ensuring the passage of electric current at full power   when powering on said lamp.   2) System according to claim 1, characterized in that it comprises a transformer (5) whose secondary winding (7) is arranged on the circuit in series with the electric lamp, the auxiliary circuit on which is arranged the winding secondary (8) with   means for short-circuiting this primary.   3) System according to claim 2, characterized in that the   primary circuit (8) has an inverter (2) which can short circuit the primary winding (8).   4) System according to claim 3, characterized in that the inverter is controlled by two excitation coils (9) and (13).   5) System according to one of claims 3 or 4, characterized in   that another inverter (1) is placed between the common contact (10) of the inverter (2) on the one hand, and the intermediate taps of the winding primary (8) on the other hand.   6) System according to claim 5, characterized in that the pourer (1) is controlled by two excitation coils (14) and (15).   7) The following system, one of claims 5 or 6, characterized   in that each of the two inverters (1) and (2) is controlled by inverters (3) and (4).   8) System according to claim 7, characterized in that at least one of the inverters (3) and (4) is controlled by a clock.   9) System according to claim 7, characterized in that at least one of the inverters (3) and (4) is controlled by a sensitive device in the light.   System according to one of Claims 5 to 8, characterized   in that it comprises a self-transformer whose secondary is disposed   between the common points of the inverters (1) and (2).