Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
  • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
  • H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
  • B62J6/00—Arrangement of optical signalling or lighting devices on cycles; Mounting or supporting thereof; Circuits therefor
  • B62J6/01—Electric circuits
  • B62J6/015—Electric circuits using electrical power not supplied by the cycle motor generator, e.g. using batteries or piezo elements
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
  • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
  • H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
  • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
  • H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
  • H02J7/1407—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle on vehicles not being driven by a motor, e.g. bicycles

Definitions

• the invention relates to a circuit for automatic discharge protection of a passive current source, which is loaded by e.g. bicycle lamps.
• the bicycle lamps can only emit light during bicycling, i.e. when the dynamo lamp is activated.
• the lamps are off which means that the cyclist is running a great risk of being overlooked in the traffic.
• a secondary current source in the form of a passive current source furnishing the lamps with current when the cyclist is stopping.
• the change-over between these two power sources may take place electronically for instance so that the secondary power source is cut in when the voltage of the dynamo falls below a certain level. This is known from e.g. the specification to DT-OS No.
• the circuit consists of an emitter follower which by means of a zener diode functions as excess-voltage protection for battery and lamps.
• the circuit does not protect the battery which most advantageously is constituted by rechargeable Ni-Cd-cells, against a considerable discharging, shortening the lifetime of the cells considerably, reducing the efficiency and perhaps causing a change in polarizing.
• the electronic circuit performing this cutting out consists of a transistor circuit in the collector emitter circuit of which a relay coil is adapted to operate a switch for cutting out and cutting in the load .
• the base voltage of the transistor is provided by the current source via a voltage divider whi ch thus loads the current source whether the load is cut in or cut out .
• This idle load is not very heavy, however , but enough as to make the device unfit for delivering the power supply to a bicycle, as a bicycle often remains unused for a very long period . Even a moderate discharging of the Ni-Cd-cells may thus cause damage to them.
• This is achieved in that the current source feeds the load via the emitter collector circuit of a transistor, that the basis of this transistor is connected to a zener diode via a resistor, and that the joint point of the resistor and the zener diode is connected to the current source via a resistor.
• This construction is simple and inexpensive to produce and secures the current source completely against discharging when the supply voltage falls below the threshold value determined by the zener diode.
• the circuit is thus especially suitable for being mounted on bicycles .
• a dynamo 1 is shown, which is connected to two electrical bulbs 4 and 5, e.g. the front and rear lights of a bicycle, via a resistor 2 and a relay switch 3.
• the dynamo 1 is furthermore via a diode 6 connected to a number of Ni-Cd-cells 7, which are connected in series to a circuit breaker 3.
• a capacitor 9 is earthed parallel to the cells 7.
• a relay 10 is connected to the dynamo 1 in series with another diode 11, the relay 10 being connected in parallel to another capacitor 12.
• the Ni- Cd-cells 7 are connected to the electrical bulbs 4 and 5 via the emitter collector circuit of a transistor 13 and the switch 3, and loaded by a resistor 14 and a zener diode 15 connected in series.
• the basis of the transistor 13 is via a resistor 16 connected to the zener diode 15 and thus to the cells 7 via the resistor 14.
• the circuit is functioning in the following manner .
• the re lay swit c h 3 is in a position of rest , shown with a dot -and-dash line , so that the electrical bulbs 4 and 5 under certain conditions , which will be explained later , are fed by the Ni-Cd-cells 7 via the emitter collector circuit of the transistor 13 .
• the capacitor 12 is first charged through the diode 11 , whereupon power starts to run through the relay 10 , which draws the relay switch 3 to the position shown with the solid line .
• the electrical bulbs 4 and 5 are now fed by the dynamo 1 , whic h simultaneously charges the Ni-Cd-cells , which are protected against a too powerfull charging by the circuit breaker 8.
• the relay switch 3 switches back to the position shown with the dot-and-dash line, whereby the Ni-Cd-cells 7 take over the feeding of the electrical bulbs 4 and 5. If the voltage of the Ni-Cd-cells 7 falls to a voltage below the puncture voltage of the zener diode 15, power cannot pass through the zener diode 15, which means that the emitter basis voltage drop of the transistor 13 is switched off. Thus the switch-off of the transistor 13 will follow the characteristic of the zener diode 15.
• the construction shown in the example can be used within a large voltage range by suitably dimensioning the components.
• the invention is not limited to the use shown in the example, i.e. protection of the secondary current source of bicycle lamps, as the construction may be used in connection with all kinds of current sources.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Power Engineering (AREA)
• Lighting Device Outwards From Vehicle And Optical Signal (AREA)
• Emergency Protection Circuit Devices (AREA)
• Circuit Arrangement For Electric Light Sources In General (AREA)
• Charge And Discharge Circuits For Batteries Or The Like (AREA)
• Protection Of Static Devices (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8135102

Family Applications (1)

Country Status (6)

Families Citing this family (3)

Family Cites Families (4)

• 1979
  • 1979-10-31 DK DK461079A patent/DK144397C/da active
• 1980
  • 1980-10-28 WO PCT/DK1980/000065 patent/WO1981001349A1/en not_active Application Discontinuation
  • 1980-10-28 NL NL8020418A patent/NL8020418A/nl unknown
• 1981
  • 1981-05-19 EP EP80902172A patent/EP0038837A1/en not_active Withdrawn
  • 1981-06-29 SE SE8104050A patent/SE423586B/sv unknown
  • 1981-06-29 NO NO812212A patent/NO812212L/no unknown

Non-Patent Citations (1)

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