DE102015111784A1 - circuitry - Google Patents

circuitry

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Publication number
DE102015111784A1
DE102015111784A1 DE102015111784.3A DE102015111784A DE102015111784A1 DE 102015111784 A1 DE102015111784 A1 DE 102015111784A1 DE 102015111784 A DE102015111784 A DE 102015111784A DE 102015111784 A1 DE102015111784 A1 DE 102015111784A1
Authority
DE
Germany
Prior art keywords
voltage
signal generator
transistor
circuit arrangement
source
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE102015111784.3A
Other languages
German (de)
Inventor
Michael Zander
Franz-Josef Wewer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Trelock GmbH
Original Assignee
Trelock GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Trelock GmbH filed Critical Trelock GmbH
Priority to DE102015111784.3A priority Critical patent/DE102015111784A1/en
Publication of DE102015111784A1 publication Critical patent/DE102015111784A1/en
Withdrawn legal-status Critical Current

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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B45/00Circuit arrangements for operating light emitting diodes [LED]

Abstract

The invention relates to a circuit arrangement for a lighting device, in particular for a bicycle lamp, comprising a primary voltage source (2) providing a primary voltage, which is conductively connected to a semiconductor light source (3) emitting light when a forward voltage is applied, and a secondary voltage source (4) connected to a signal generator (5) and with a parallel to the signal generator (5) connected switching element (9) is connected. The switching element (9) is adjustable by a switching voltage between a passage configuration in which the signal generator (5) is inactive, and a blocking configuration in which the signal generator (5) is active, wherein the switching voltage by a voltage difference between the primary voltage of the primary voltage source ( 2) and the forward voltage of the semiconductor light source (3), and wherein the switching element (9) is adapted to switch from the forward configuration to the blocking configuration when the primary voltage falls below a voltage limit, thereby activating the buzzer (5).

Description

  • The present invention relates to a circuit arrangement for a lighting device and to a method for signaling a low-voltage state of a primary voltage source.
  • In lighting equipment, especially in bicycle lights, the market share of lighting devices with semiconductor light sources has grown strongly in the recent past, the voltage source is formed by a battery or an accumulator. In these lighting devices, it has proved to be extremely disadvantageous that their functionality is no longer given falls below a voltage value of the voltage source. Particularly in the case of use in forest areas but also in illuminated urban areas, the failure of the illumination device entails an increased risk of accidents, since the user is easily overlooked by third parties or is himself unable to recognize impending dangers such as potholes.
  • From the DE 297 19 543 already a lighting device is known, the circuit arrangement is designed so that the voltage of the voltage source and thus the remaining light duration is measured permanently and displayed on a separate display to visualize the user the current residual charge state of the voltage source of the illumination device. However, it has proven to be extremely disadvantageous that the energy needed to operate the additional display is not available for the power supply of the lighting device.
  • The underlying task of the circuit arrangement is therefore to provide a circuit arrangement for a lighting device, which reduces the above-mentioned disadvantages.
  • This object is achieved by a circuit arrangement which comprises a primary voltage source providing a primary voltage, which is conductively connected to a semiconductor light source emitting light when a forward voltage is applied, and a secondary voltage source which is connected to a signal generator and to a switching element connected in parallel with the signal generator, which is adjustable by a switching voltage between a passage configuration in which the signal generator is inactive and a blocking configuration in which the signal generator is active, the switching voltage being determined by a voltage difference between the primary voltage of the primary voltage source and the forward voltage with the semiconductor light source, and wherein the switching element is designed such that it switches from the forward configuration into the blocking configuration when the primary voltage falls below a voltage limit, whereby the signal generator is activated.
  • This circuit arrangement ensures in a simple manner that falling below a voltage limit of the primary voltage is detected and signaled to the user, since then the switching element is transferred into the blocking configuration, whereby ultimately the signal generator is activated. By the signal generator, the user is displayed in a simple manner that the primary voltage source has reached a voltage limit. The user is now forewarned that the remaining remaining illumination duration of the illumination device is reduced and can either convert it to a mode in which it consumes less energy, or plan a change of the primary voltage source and make it timely. At the same time, it is ensured by the circuit according to the invention that no additional energy is required for monitoring the state of charge of the primary voltage source. In addition, since the signal generator is powered by the secondary voltage source, the operation of the signal generator does not adversely affect the remaining residual voltage of the primary voltage source. In the context of the invention, it is also provided that the primary voltage source and / or the secondary voltage source can be charged.
  • In this context, it has also proven to be particularly favorable when the switching element is formed as a first transistor whose collector-emitter path is connected in parallel with the signal generator, wherein the switching voltage is applied to the base of the first transistor and a base emitter Voltage forms. The transistor used is a simple to manufacture component, which is inexpensive and can be realized with the precise switching. As long as the base-emitter voltage is above the forward voltage of the first transistor, it is in the forward configuration, whereby the signal generator connected in parallel with the collector-emitter path is inactive. Only when the base-emitter voltage applied to the base, which is determined by the voltage difference between the primary voltage and the forward voltage, drops below the forward voltage, the first transistor is switched to the blocking configuration, in which then the signal generator is active.
  • In order to set the voltage limit, is activated at the signal generator, it has also proved to be particularly advantageous if the first transistor, a first voltage divider is connected upstream, which is formed of a first and a second resistor. By the suitable Choice of the resistors of the first voltage divider can be in a simple way to specify the voltage limit of the primary voltage source, below which the switching element is transferred from the passage configuration in the blocking configuration to activate the signal generator.
  • In order to increase the reliability of the circuit arrangement according to the invention, it has also been shown to be favorable if, to limit the current flowing through the semiconductor light source, a constant current source is provided which ensures that the current flowing through the semiconductor light source always remains constant. It has also proved to be particularly advantageous if the constant current source is realized by an auxiliary circuit comprising a second and a third transistor and a third and a fourth resistor. This realizes, in a simple but effective manner, a resistance whose resistance value matches the existing voltage, thereby ensuring that the current flowing through the semiconductor light source remains constant, which has a positive effect on the life of the semiconductor light source used in the circuit.
  • It has also proven itself, if a second transistor is provided, whose collector-emitter path is connected in series with the signal generator. This has particular circuit advantages when charging the primary and secondary voltage source, wherein it has also been shown in this context advantageous if a second voltage divider is provided, which is connected upstream of the base-emitter path of the second transistor and a fifth and is formed of a sixth resistor.
  • In the context of the invention, it has also been shown to be particularly favorable when the signal generator is formed from an optical signal transmitter, in particular from a second semiconductor light source, or from an acoustic signal generator, in particular a loudspeaker. Depending on the intended use of the circuit arrangement according to the invention, an optical signal transmitter or an acoustic signal transmitter is preferred. If the circuit arrangement according to the invention, for example, be used in a bicycle front light, then an optical signal transmitter can be used, since it can be integrated into the housing of the bicycle front light that this is always in the field of view of the user, thus the status change of the signal generator at a glance can capture. On the other hand, if the lighting device is a bicycle rear light, it has also proved to be advantageous if the signal transmitter is formed as an acoustic signal generator, since then the undershooting of the primary voltage can be signaled by an acoustic signal. This ensures that the user can perceive the status change of the signal generator without having to take his eyes off the road, which has a positive influence on traffic safety. In the context of the invention, it is also provided that the signal generator is formed of an optical and an acoustic signal generator.
  • In this context, it has also proven particularly useful if the second semiconductor light source of the signal generator is formed as a red light emitting LED. This is particularly easy to perceive and thus particularly suitable to indicate the drop in the primary voltage below the voltage limit.
  • It has also proven to be advantageous if a capacitor is provided which is connected in parallel to the sixth resistor. As a result, signal smoothing is achieved, which has a positive influence on the operation of the signal generator.
  • The method of the present invention is based on the object to avoid an unexpected extinction of the semiconductor light source of a lighting device and to inform the user in good time about a low voltage state of a primary voltage source.
  • This object is achieved according to the invention by a method for signaling a low-voltage state of a primary voltage providing primary voltage source of a lighting device with a semiconductor light source which emits light when applying at least one forward voltage according to claim 11. In this case, the primary voltage of the primary voltage source is first applied to the semiconductor light source when emitting at least one forward voltage emitted light. To a first transistor is then applied a base-emitter voltage, which depends on the voltage difference between the primary voltage and the forward voltage. A signal generator remains inactive by the circuit of the first transistor in a forward configuration, as long as the primary voltage is above a voltage limit. When the primary voltage drops to or below the voltage limit, the switch is activated by switching the first transistor to a blocking configuration.
  • By this method is ensured in a simple manner that falls below a predetermined voltage limit by the activation of the signal generator is displayed and thus signals to the user that the primary voltage source has reached a low voltage value.
  • In this context, it has also proved to be particularly advantageous if a secondary voltage source feeds the signal generator. By using the secondary voltage source, which can be recharged like the primary voltage source, it is ensured that the signal generator can be operated independently of the state of charge of the primary voltage source, which has a positive influence on the operational safety.
  • In order to set the voltage limit, it has also proven to be, if this is specified by a voltage divider. This can be set at which voltage value of the primary voltage source of the signal generator is activated.
  • In the following the invention is explained in more detail in exemplary embodiments illustrated in the drawings; show it:
  • 1 A first embodiment of the circuit arrangement according to the invention,
  • 2 A second embodiment of the circuit arrangement according to the invention with a first voltage divider,
  • 3 a third embodiment of the circuit arrangement according to the invention with a second voltage divider, and
  • 4 A fourth embodiment of the circuit arrangement according to the invention with an auxiliary circuit.
  • 1 shows a first embodiment of the circuit arrangement according to the invention 1 comprising a primary voltage source providing a primary voltage 2 using a semiconductor light source 3 is conductively connected. When a forward voltage is applied, the semiconductor light source emits 3 Light. The circuit arrangement 1 further comprises a secondary voltage source 4 that with a signaler 5 is conductively connected. The signal generator 5 is in the embodiment shown as a second semiconductor light source 6 executed, which is a series resistor 7 upstream. Parallel to the signal generator 5 is the collector-emitter-straightener of a first transistor 8th switched, which is a switching element 9 which is adjustable depending on the applied base-emitter voltage between a pass-through configuration and a blocking configuration. In the passage configuration is the signaler 5 inactive while in the blocking configuration of the first transistor 8th the signal generator 5 is active. The circuit for the first transistor 8th the base-emitter voltage used between the forward configuration and the reverse configuration becomes the voltage difference between the primary voltage of the primary voltage light source 2 and the forward voltage of the semiconductor light source 3 certainly. If this falls below a voltage limit, the first transistor switches 8th from the pass-through configuration into the blocking configuration, causing the auto switch 5 is activated.
  • In the in the 2 illustrated embodiment is the first transistor 8th a first voltage divider 10 upstream, which is formed of a first resistor R1 and a second resistor R2. By the suitable choice of the individual resistors R1 and R2 of the first voltage divider 10 can be located at the base of the first transistor 8th Specify applied base-emitter voltage targeted and thus ultimately the voltage limit at which the first transistor 8th from the pass-through configuration into the blocking configuration, causing the auto switch 5 is activated.
  • In the embodiment of the circuit arrangement according to the invention according to 3 is a second transistor 11 provided, whose collector-emitter-Strecker in series with the signal generator 5 is switched. There is also a second voltage divider 12 provided, that of the base-emitter path of the second transistor 11 is connected upstream and is formed of a third resistor R3 and a fourth resistor R4. Parallel to the fourth resistor R4 is a capacitor 13 connected.
  • In the in the 4 illustrated embodiment of the circuit arrangement according to the invention 1 is also an auxiliary circuit 17 provided that a constant current source 14 forms, which by the semiconductor light source 3 keeps flowing current constant and from a third transistor 15 and a fourth transistor 16 and a fifth resistor R5 and a sixth resistor R6.
  • The method according to the invention will be explained again below. With fully charged primary voltage source 2 its primary voltage is greater than the forward voltage of the semiconductor light source 3 and therefore sufficient to operate them. In this state, the one on the first transistor 8th applied base-emitter voltage, which is determined by the voltage difference between the base voltage and the forward voltage, greater than the forward voltage of the first transistor 8th , This is thus in the passage configuration and the voltage of the secondary voltage source 4 falls off via its collector-emitter path while the signal generator connected in parallel therewith 5 remains inactive. When the primary voltage drops so low that the base-emitter voltage becomes smaller than the forward voltage of the first transistor 8th then it switches from the pass-through configuration to the lock configuration, causing the signaler 5 is activated. To specify the voltage limit of the primary voltage at which the first transistor 8th turns on, this is the first voltage divider 10 upstream, by which it is possible by a suitable choice of the resistors used, the signal generator 5 to activate to a predefined voltage limit of the primary voltage.
  • LIST OF REFERENCE NUMBERS
  • 1
    circuitry
    2
    Primary power source
    3
    Semiconductor light source
    4
    Secondary voltage source
    5
    signaler
    6
    second semiconductor light source
    7
    dropping resistor
    8th
    first transistor
    9
    switching element
    10
    first voltage divider
    11
    second transistor
    12
    second voltage divider
    13
    capacitor
    14
    Constant current source
    15
    third transistor
    16
    fourth transistor
    17
    auxiliary circuit
    R1
    first resistance
    R2
    second resistance
    R3
    third resistance
    R4
    fourth resistance
    R5
    fifth resistance
    R6
    sixth resistance
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
  • Cited patent literature
    • DE 29719543 [0003]

Claims (13)

  1. Circuit arrangement for a lighting device, in particular for a bicycle lamp, comprising a primary voltage source providing a primary voltage ( 2 ) with a semiconductor light source emitting light when applying a forward voltage ( 3 ) is conductively connected, and a secondary voltage source ( 4 ) with a signal generator ( 5 ) and with a parallel to the signal generator ( 5 ) switched switching element ( 9 ), which is adjustable by a switching voltage between a passage configuration in which the signal transmitter ( 5 ) is inactive, as well as a blocking configuration in which the signal generator ( 5 ) is active, wherein the switching voltage by a voltage difference between the primary voltage of the primary voltage source ( 2 ) and the forward voltage of the semiconductor light source ( 3 ), and wherein the switching element ( 9 ) is designed such that it switches from the forward configuration into the blocking configuration when the primary voltage falls below a voltage limit, whereby the signal generator ( 5 ) is activated.
  2. Circuit arrangement according to Claim 1, characterized in that the switching element ( 9 ) as a first transistor ( 8th ) whose collector-emitter path is parallel to the signal generator ( 5 ), and wherein the switching voltage at the base of the first transistor ( 8th ) and forms a base-emitter voltage.
  3. Circuit arrangement according to Claim 1 or 2, characterized in that the switching element ( 9 ) a first voltage divider ( 10 ), which is formed of a first resistor (R1) and a second resistor (R2).
  4. Circuit arrangement according to one of claims 1 to 3, characterized in that for limiting by the semiconductor light source ( 3 ) flowing current a constant current source ( 14 ) is provided.
  5. Circuit arrangement according to Claim 4, characterized in that the constant current source ( 14 ) by an auxiliary circuit ( 17 ) is realized, which is a third transistor ( 15 ) and a fourth transistor ( 16 ) and a fifth resistor (R5) and a sixth resistor (R6).
  6. Circuit arrangement according to one of Claims 1 to 5, characterized in that a second transistor ( 11 ) whose collector-emitter path is connected in series with the signal generator ( 5 ) is switched.
  7. Circuit arrangement according to Claim 6, characterized in that a second voltage divider ( 12 ), which is the base-emitter path of the second transistor ( 11 ) and is formed of a third resistor (R3) and a fourth resistor (R4).
  8. Circuit arrangement according to one of claims 1 to 7, characterized in that the signal transmitter ( 5 ) is formed from an optical signal transmitter, in particular from a second semiconductor light source ( 6 ), or from an acoustic signal generator, in particular a loudspeaker.
  9. Circuit arrangement according to Claim 8, characterized in that the second semiconductor light source ( 6 ) of the signal generator ( 5 ) is formed as a red light emitting LED.
  10. Circuit arrangement according to one of claims 7 to 9, characterized in that a capacitor ( 13 ) is provided, which is connected in parallel to the sixth resistor (R6).
  11. Method for signaling a low-voltage state of a primary voltage source providing a primary voltage ( 2 ) of a lighting device with a semiconductor light source ( 3 ) which emits light when at least one forward voltage is applied, the method comprising the following steps: - providing the primary voltage to the semiconductor light source ( 3 ), - applying a base-emitter voltage to a first transistor ( 8th ), which depends on the potential difference between the primary voltage and the forward voltage, - deactivating a signal generator ( 5 ) by switching the first transistor ( 8th ) into a transmission configuration as long as the primary voltage is above a voltage limit, and - activating the signal generator ( 5 ) by switching the first transistor ( 8th ) into a blocking configuration when the primary voltage drops to or below the voltage limit.
  12. Method according to claim 11, characterized in that a secondary voltage source ( 4 ) the signal transmitter ( 5 ) feeds.
  13. Method according to Claim 11 or 12, characterized in that the voltage limit is determined by a first voltage divider ( 10 ) is given.
DE102015111784.3A 2015-07-21 2015-07-21 circuitry Withdrawn DE102015111784A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102015111784.3A DE102015111784A1 (en) 2015-07-21 2015-07-21 circuitry

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015111784.3A DE102015111784A1 (en) 2015-07-21 2015-07-21 circuitry
EP16178846.8A EP3122157A1 (en) 2015-07-21 2016-07-11 Switching assembly

Publications (1)

Publication Number Publication Date
DE102015111784A1 true DE102015111784A1 (en) 2017-01-26

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ID=56557481

Family Applications (1)

Application Number Title Priority Date Filing Date
DE102015111784.3A Withdrawn DE102015111784A1 (en) 2015-07-21 2015-07-21 circuitry

Country Status (2)

Country Link
EP (1) EP3122157A1 (en)
DE (1) DE102015111784A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09172687A (en) * 1995-12-20 1997-06-30 Fujitsu General Ltd Remote controller
DE29719543U1 (en) 1997-11-04 1998-04-02 Asl Automatisierungs Gmbh Battery operated bike and pocket light
DE102005012625A1 (en) * 2005-03-18 2006-09-28 Infineon Technologies Ag Switch for controlling LED, has switching devices providing currents for diode arrangements, and logic device controlling devices such that current for corresponding arrangement is not provided at same time

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09172687A (en) * 1995-12-20 1997-06-30 Fujitsu General Ltd Remote controller
DE29719543U1 (en) 1997-11-04 1998-04-02 Asl Automatisierungs Gmbh Battery operated bike and pocket light
DE102005012625A1 (en) * 2005-03-18 2006-09-28 Infineon Technologies Ag Switch for controlling LED, has switching devices providing currents for diode arrangements, and logic device controlling devices such that current for corresponding arrangement is not provided at same time

Also Published As

Publication number Publication date
EP3122157A1 (en) 2017-01-25

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