FI97266B - Control devices for lift cage lighting - Google Patents

Abstract

A control device for lighting in a lift cage comprises a circuit, which supplies the lighting voltage UL to the cage fitting, and a connection to the supply voltage Vin. The lighting voltage UL is lowered to a pre-set fraction of the supply voltage Vin when the status signal indicating that there are no passengers present in the cage and the status signal indicating that the cage door is shut are both simultaneously in force in the control device. <IMAGE>

Description

97266

ELEVATOR CAR LIGHTING CONTROL EQUIPMENT

The present invention relates to an elevator car lighting control device as defined in the preamble of claim 1.

5

In the lighting of the elevator car, a compact luminaire with a halogen lamp has recently become more common, which has otherwise increased its popularity as interior luminaires. The compact halogen luminaire is easy to place in the elevator car. For halogen-10 units, the standard operating voltage of 12 V is also suitable for elevator operation. The problem with halogen lamps, however, is the relatively low lifespan of the lamps, which is the result of a typical burning time of 1500-3000 hours. The low service life results in a high need for maintenance and thus costs, mainly in the form of labor due to the replacement of the lamp-15 and also in the price of a new lamp. The low lifespan of the lamp may also lead to a lack of intermittent lighting in the elevator car, resulting in significant annoyance and inconvenience to the elevator user.

20 To prolong the life of the lamps, it is used to keep the lamp switched off when the lift is not in use. However, turning the lamp on and off will reduce the lamp life. Indeed, such an arrangement may, in an unfavorable case, even increase the need to replace the lamp.

25

As a solution to the above need, a lighting control device is presented as an invention. The control device according to the invention is characterized by what is stated in the characterizing part of claim 1.

30

The invention can achieve advantages e.g. as follows: -The replacement interval of the lamp in the elevator car's halogen lamp is extended 2-5 * times, which reduces the need for maintenance costs and costs accordingly.

The invention can also be applied to the control of the operation of non-halogen lamps.

-The use of the invention reduces the amount of energy used for lighting.

2 97266

The invention will now be described in more detail by means of some application examples with reference to the accompanying drawings, in which Figure 1 shows a circuit applying the invention and Figure 2 shows signal forms in a circuit applying the invention.

Figure 1 shows an apparatus according to the invention in a circuit diagram. The circuit controls the lighting voltage based on the information provided by the UL passenger detection sensor and the door information. Voltage lighting refers here to the operating voltage of the body lamp supplied to the body lamp. 15 The 'human body sensor1' type 1 sensor 1, which is sensitive to heat radiation, senses in the elevator car whether there are people in the elevator car or whether the elevator car is empty. The sensor provides a high voltage signal level in the circuit in the conductor 2 when the elevator car is occupied. When the elevator car is unoccupied on the conductor 2, the signal-20 lith level is low. The conductor 3 has a signal indicating the status of the door leading to the elevator car. When the door is open, the signal level of conductor 3 is high and when the door is closed, the signal level is low. Based on the signals in conductors 2 and 3, the lighting voltage to the lamp is controlled. The lighting voltage (UL) is reduced to 25 supply voltages (Vin) in a situation where both the status information indicating the absence of a passenger and the status information indicating the presence leading to the car are valid in the control equipment at the same time. Otherwise, the lighting voltage is kept substantially equal to the supply voltage. This procedure 30 achieves that the lamp is continuously 'preheated' and as if in standby mode for ignition, so that ignition does not strain it as much as in the absence of 'preheating'. Preheating also consumes virtually no lamp life.

In the NOR circuit 4 acting as a reference element, a signal C is generated on the basis of the signals of the conductors 3 and 2, which is fed to the first input of the hysteresis element 5 implemented with the Schmitt trigger. The output signal B of the hysterical element is fed back to the second input of the Schmitt trigger 5. In a situation where either the elevator car door is open or the sensor 1 detects radiant heat radiation from the body, i.e. if one of the signals 2 or 3 is high, the signal C is low. When signal C is low, then output signal B is high. When the signal C is high, the output signal B is a square wave whose pulse ratio is set by the feedback resistor R1, i.e., when the signal C is high, the circuit around it begins to oscillate. A diode is connected in series with the feedback resistor R1. The feedback resistor R1 and the diode connected in series with it are connected in parallel with the relatively large resistor R2. The output signal B is inverted into a signal A which controls the lighting voltage UL in the supply circuit of the lamp 15. The illumination voltage UL is essentially the inverted average of the signal A. In the supply circuit, the signal A controls the switch 6. The control of the switch 6 is connected by a resistor R3 to the supply voltage UL so that the value of the signal A is practically the same as the supply voltage. The value of signal A 20 low is determined by the components preceding the circuit. Between the switch 6 and ground, a circuit part is formed by the coil L1 and the capacitor C1, to which the supply voltage interrupted by the switch is applied, and from which the lighting voltage UL is taken out between the coil and the capacitor. Thus, the lighting voltage UL is the full supply voltage Vin from the external voltage source 25 when the door is open or occupied by the elevator car, and otherwise the lighting voltage 1 is reduced to a fraction following the pulse ratio of the output signal B of the member 5. In Figure 2, signals A, B, C and UL are shown.

30

It will be apparent to those skilled in the art that the various embodiments of the invention are not limited to the examples set forth above, but may vary within the scope of the claims set forth below.

Claims (5)

An elevator car lighting control apparatus, comprising a circuit for supplying a lighting (UL) for a car lighting and a connection to a voltage source having a supply voltage (Vjn), characterized in that the lighting voltage (UL) is reduced to a set fraction of the supply voltage (Vin). in a situation where both the status information indicating the absence of a passenger and the status information indicating the closure of the door 10 leading to the elevator car are valid in the control equipment at the same time. Control device according to claim 1, characterized in that the control device comprises - an input (2) for obtaining status information about the presence and absence of a passenger, - an input (3) for obtaining door information, a member (4) connecting a passenger presence and absence information status information and door information into a single status information signal (C) having two possible states, the first of which (low) indicates that there is a passenger in the elevator car or the elevator car door is open, and the second (high) indicates that the elevator car door is closed and the elevator car is blank and means for controlling the lighting voltage (UL) so that when the status information signal (C) is in its first state (low) 25 the lighting voltage (UL) is substantially equal to the supply voltage (Vin) and when the status information signal (C) is in its second state (high) lighting voltage (UL) ) is substantially lower than the supply voltage (Vin). Control device according to Claim 2, characterized in that a device (1) for detecting the presence of a person in the elevator car can be connected to the entrance (2), which indicates the presence and absence of a passenger as status information. 1 I Ittri ärlli (citation * Lighting installation according to one of the preceding claims, characterized in that the reduced lighting voltage (UL) is generated by means of a pulse-shaped control signal (A). 97266 4 97266 Lighting installation according to one of the preceding claims, characterized in that the reduced lighting voltage (UL) is a part of the control signal (A) equal to the pulse ratio * supply of the voltage (Vin). 97266