WO2009003522A1

WO2009003522A1 - Circuit arrangement for identifying switch-on sequences for an on/off switch

Info

Publication number: WO2009003522A1
Application number: PCT/EP2007/056749
Authority: WO
Inventors: Harald Dellian; Franz Maier
Original assignee: Osram Gesellschaft mit beschränkter Haftung
Priority date: 2007-07-04
Filing date: 2007-07-04
Publication date: 2009-01-08

Abstract

The invention relates to a circuit arrangement for identifying switch-on sequences for an on/off switch, with a first flip-flop (30) for outputting a state signal, wherein a first capacitor (C1) is charged by a voltage supply (3) via a first diode (D1) and a charging resistor (R3) with a charge time constant (1) via an on/off switch when the latter is switched on, and this charging voltage is fed via a second capacitor (C2) and is applied to the switching input of the first flip-flop (30) via a second diode (D2), the output (A1) of said first flip-flop then outputting a corresponding state signal for evaluation, wherein, when the circuit arrangement is switched off, the first capacitor is discharged again via a discharge resistor (R3) with a defined time constant (2). The invention likewise relates to a method for generating a state signal on the basis of the time-dependent actuation of an on/off switch, having the steps of: - generation of a voltage curve with a defined time dependency with the on/off switch switched on, - differentiation of the voltage curve for generating a voltage pulse, - application of the voltage pulse to one or more threshold value elements, - application of the resultant signal to one or more storage elements for representing the state signal.

Description

description

[1] Circuit arrangement for detecting switch-on sequences for an on / off switch.

Technical area

[2] The invention relates to applications in which the consumer is switched on or off hard for energy-saving or other reasons. As a result, these devices do not have a "stand-by mode", making it difficult to control various operating modes through a single on / off switch.

State of the art

[3] So far, mechanical tap-changers have been used for various modes when switched on. These either switch through different phases, which are then applied to the consumer, or different signals are switched in addition to the on / off function of the switch and fed to the consumer for evaluation. In many applications, e.g. in existing installations, but no corresponding tap changer are available, but only normal on / off switch, the hard on or off the consumer. Here, the switch is often used only as a signal switch, and the consumer still connected permanently to the power supply, so that he is able to process the signals supplied by the switch. However, this entails an increased power consumption, which has the disadvantages of increased operating costs. In electrical appliances, it is possible to use mechanical tap changers, but these are very expensive and error-prone.

task It is therefore an object of the invention to provide a circuit arrangement which is capable of a power-up sequence, which is generated with a simple switch, without permanent power supply to detect, and to transmit by means of suitable signals to the consumer.

Presentation of the invention

[5] The object is achieved by a circuit arrangement according to claim 1. The circuit arrangement is simple and can be used in many different areas. According to the invention, a first capacitor C2 is charged via the on / off switch when switching on via a charging resistor R3 and a first diode. This charging voltage is conducted via a second capacitor C1 and conducted via a second diode to the switching input of a flip-flop. The flip-flop may consist of a logic gate, but it may also be implemented discretely. The flip-flop is designed so that it assumes a defined state in the absence of input signal.

[6] If the on / off switch is then switched on again after a longer switch-off time, all capacitors are initially discharged and therefore charge up quickly. This results in a high voltage change rate on the first capacitor, which is converted via the second capacitor and the second diode into a pulse which switches the flip-flop, and thus at the output of the flip-flop Al, a state signal is available.

[7] After switching off the on / off switch, the first capacitor is slowly and defined via a resistor discharged. Now, if the on / off switch is pressed again after a short time and thus closed, so much charge is stored in the first capacitor. The capacitor charges itself accordingly slower, and the lower voltage change rate causes only a small pulse is applied to the input of the flip-flop via the second capacitor and the second diode, which can not switch this. Since no input signal is present at the flip-flop, it falls into a defined state, which is achieved by suitably dimensioning the resistors and the presence of C3, which connects the two outputs of the flip-flop in the discrete version to the power supply becomes. Due to the additional voltage pulse via D2, the second input of the flip-flop, 'come up faster', and the flip-flop is thus in a different switching state than when switching on the circuit after a long break.

The circuit thus makes it possible to detect whether the device in question after a longer off time is turned on again, or whether it was only briefly off and immediately turned on again. This can e.g. be used to dim a flashlight when switching to a first light level, and to dim after a short off and on again to a second light level.

In a further embodiment, the first diode is replaced by two Zener diodes, which in turn are connected to two flip-flops. This is a time-dependent representation of four states or three Switch-on states possible, which can be evaluated by the connected load.

Short description of the drawing (s)

[10] FIG. 1 Circuit arrangement according to the invention in accordance with a first embodiment.

[11] FIG. 2 Circuit arrangement according to the invention in accordance with a second embodiment.

[12] FIG. 3 Schematic block diagram of the inventive circuit arrangement

[13] Fig. 4 Some relevant signals according to the first

Embodiment.

[14] Fig. 5 Representation of various switching states using the example of an LED flashlight.

Preferred embodiment of the invention

First embodiment

[15] In Fig. 1, the inventive circuit arrangement is shown according to a first embodiment. A voltage source 3 is connected to a load L and the circuit arrangement according to the invention via an on / off switch. The load L processes the output signal of the circuit arrangement according to the invention in order to be able to represent corresponding states. This output signal can also be referred to as a status signal. As soon as the on / off switch is turned on, a first capacitor C 1 is connected to a defined one via the series connection of a first diode D 1 and a first resistor R 1 charged first time constant τl. The time constant is small and charging is therefore fast. This can be clearly seen in Fig. 4, in which the signal 22 represents the voltage across the first capacitor Cl. If the on / off switch is switched off again, the first capacitor is again discharged via a resistor R3 connected in parallel with a second defined time constant τ2. This time constant is significantly greater, so that the unloading process takes a significantly longer time. When the on / off switch is first switched on, the charging voltage of the first capacitor C1 is conducted via a second capacitor C2 and a second diode D2 to the input E1 of the flip-flop. Since the first capacitor Cl charges very quickly, this generates at the second diode D2 a pulse 242 which causes the downstream flip-flop to switch over. The status signal at the output A1 of the flip-flop is logic 0 and can be evaluated by the load accordingly.

[16] If the on / off switch is switched off, the second capacitor discharges via the discharge resistors R2 and R3, and the first capacitor C1 discharges via the discharge resistor R3. If the on / off switch is switched off only for a short period of time and then immediately switched on again, as the signal 20 in FIG. 4 shows, the first capacitor C1 discharges only very slightly, as can be seen from the signal 22 in this figure , When switching on again, a charging current flows only for a short time, and the voltage change at the first capacitor is relatively low, which results in a very small voltage pulse 244 at the diode. This pulse is not high nug to toggle the flip-flop. By means of a suitable dimensioning of the resistors R4 and R6, which connect the outputs A1 and A2 to the voltage supply, it is achieved that the flip-flop is defined when the input signal is missing in a state in which the output A1 is logic 1. This status signal 'sees' the load at its input LAi and can accordingly change the state.

[17] The signal 26 in Fig. 4 represents the current across the second diode D2. It is good to see that at the first turn on, a high current pulse flows through the diode, which causes the flip-flop to switch over after a short time Switching off and on again no current flows because the voltage across the diode is lower than its forward voltage. The signal 26 represents the voltage across a third capacitor C3. This is needed to obtain a defined turn-on sequence from the flip-flop. Signals 27 and 29 represent the voltages across resistors R5 and R7, which represent the state of the associated outputs A1 and A2.

Thus, with the circuit arrangement according to the invention three different states can be represented. Fig. 5 shows this example of an LED flashlight with 5 LEDs. In the first state (1) all LEDs are switched off. If the on / off switch is actuated, the output A1 of the circuit arrangement according to the invention is set to logical 0 and the flashlight electronics then turn on three LEDs, which corresponds to the second state (2). If the flashlight is switched off and switched on again within one second, the output A1 of the circuit arrangement according to the invention is set to 1, and the electronics of the flashlight recognize the third state (3) and turn on all the LEDs.

[19] The block diagram of the circuit arrangement according to the invention in the previous example of a flashlight is shown in FIG. The flashlight is turned on by means of the on / off switch S2. A Signalauswertelogik 47 first detects that the flashlight has been turned on. At the same time, in block 41, the first capacitor is charged via the first resistor. In block 43, the signal is applied to the flip-flop via the second capacitor and the second diode. Block 45 denotes the switching of the flip-flop. This is registered by the Signalauswertelogik 47, which then either the driver stage 48 is activated, the load Ll, in this case, three LEDs, turns on, or both driver stages 48 and 49 is activated and thus all LEDs in operation.

[20] Another embodiment would be the application of a radio-controlled socket or a radio switch. To switch different consumers or different sockets different transmission frequencies are needed. Since this is complicated and expensive, the circuit arrangement according to the invention can also be used. Here, two consumers or radio sockets can be switched via a transmission frequency.

Second embodiment

The second embodiment is not fundamentally different from the first embodiment. There will be only the differences from the first embodiment explained. In the second embodiment, three states can be displayed via two flip-flops, which can be controlled via appropriate timing of the on / off switch. A circuit diagram is shown in FIG. In principle, the second diode D2 is replaced by a respective Zener diode of different breakdown voltage, each of which controls a complete flip-flop circuit according to FIG. In the example, flip-flop 32 is the one having the zener diode with the smaller breakdown voltage in the trigger path. By means of corresponding switch-off times, either both flip-flops or only flip-flops 32 or none can be activated when switching on, so that state signals are available via the outputs A1 of the first flip-flop 30 or A3 of the second flip-flop 32 of the connected load can be made. This means that on a first switch-on after a long switch-off time both flip-flops are at logic 0. After a short break (eg, less than 1 second), both flip-flops are at logical 1. After a longer pause (eg, between one and two seconds), flip-flop 32 is at logic 0 and flip-flop 30 at logic 1. Thus Three different switch-on states can be displayed via a corresponding evaluation. The times are of course exemplary in nature, it may be the short break, for example, between 0 and 0.5 seconds and the long break between 0.5 and a second.

[22] In this embodiment, it is indicated in FIG. 2 that the voltage supply 3 can also be a mains voltage supply, which in the simplest form is simple. lent a power rectifier with appropriate backup capacitor contains. Of course, the power supply of the second embodiment opposite to the circuit diagram in Fig. 2 but also an accumulator, a battery or another self-sufficient DC voltage source. Likewise, the first embodiment can be equipped with a mains voltage supply instead of a self-sufficient DC voltage source.

Claims

claims

1. Circuit arrangement for the detection of switch-on sequences for an on / off switch, with a first flip-flop (30) for outputting a status signal, characterized in that via an on / off switch when switching on a first capacitor (Cl) by a power supply (3) is charged via a first diode (Dl) and a charging resistor (R3) with a charging time constant (τl), and this charging voltage via a second capacitor (C2) and via a second diode (D2) to the switching input of the first flip-flop ( 30) whose output (Al) then outputs a corresponding status signal for evaluation, wherein the first capacitor is discharged again when the circuit arrangement is switched off via a discharge resistor (R3) with a defined time constant (τ2).

2. A circuit arrangement according to claim 1, characterized in that the charging time constant (τl) of the first capacitor is significantly smaller than the discharge time constant (τ2).

3. Circuit arrangement according to one of claims 1 or 2, characterized in that a load to be controlled with the on / off switch on or off.

4. Circuit arrangement according to one of the preceding claims, characterized in that the first flip-flop (30) via a first Zener diode (DlO) to the second capacitor (C2) is connected, and a second flip-flop (32) is connected to the second capacitor via a second zener diode (D22), and the two zener diodes have different zener voltages.

5. Circuit arrangement according to claim 4, characterized in that the outputs (Al, A3) of the two flip-flops generate a status signal for displaying three switch-on states.

6. Circuit arrangement according to claim 3, characterized in that the load to be controlled an input

(LAi) for evaluating the status signal possesses.

7. Circuit arrangement according to one of the preceding claims, characterized in that on the state signal different states are set in the load.

8. Lighting device according to one of the preceding claims 1-7, characterized in that the load includes a light source, which is dimmed according to the state signal to different dimming levels.

9. A method for generating a state signal due to the time-dependent actuation of an on / off switch, characterized by the following steps:

- Generation of a voltage curve with a defined time dependency when switched on

A / Aussehalter,

Differentiating the voltage curve to generate a voltage pulse, Applying the voltage pulse to one or more thresholds,

- Apply the resulting signal to one or more memory elements to represent the state signal.