JP5078950B2 - LED traffic light - Google Patents

Description

  The present invention relates to an LED traffic light used for a signal control system such as a railway, and more particularly to simplification of a circuit configuration.

  An existing signal control system that performs lighting control of a railway traffic signal is connected to each signal lamp by a one-to-one individual wiring and transmits a control signal. For this reason, it is necessary to handle a large number of electric wirings, and construction and maintenance are not easy. In order to solve this problem, a new signal control system using a multiplexed information transmission system by connecting each signal lamp with an optical LAN is disclosed.

  When switching an existing signal control system using individual wiring to a new signal control system with a multiplexed information transmission system, the existing signal control system and the new signal control system are connected to smoothly switch to the new signal control system. Japanese Patent Application Laid-Open No. H10-228688 discloses an LED traffic light that coexists with the above signal control system.

  As shown in the circuit diagram of FIG. 4A, the LED traffic light 1a disclosed in Patent Document 1 blinks in response to control signals from an existing signal control system 10 and a new signal control system 20, and is small in size. A terminal 21 and an LED unit 31 are included. The small control terminal 21 is supplied with power via the isolation transformer 4, and multiplex information transmitted from the new signal control system 20 via the LAN cable is individualized and a control signal is output to the LED unit 31. As shown in the circuit diagram of FIG. 4B, the LED unit 31 is connected to the LED light emitting unit 5 and the existing signal control system 10 by individual wiring, and receives the control signal transmitted from the existing signal control system 10. A first rectifier circuit 6 that rectifies and supplies a drive current to the LED light emitting unit 5, and a second rectifier circuit 7 that rectifies a control signal from the small control terminal 21 and supplies a drive current to the LED light emitting unit 5. Have. A circuit that supplies a drive current from the first rectifier circuit 6 to the LED light emitting unit 5 is provided with a diode 8 that blocks the drive current from the second rectifier circuit 7 and a wraparound prevention circuit 32. A compound display correspondence circuit 33 is provided in parallel with the wraparound prevention circuit 32, the diode 8, and the LED light emitting unit 5. As shown in the circuit diagram of FIG. 5, in the composite display corresponding circuit 33, for example, in a state where two LED units 31Y and 31G are connected in series as a composite display target, one of the LED light emitting units 5 is disconnected. When this happens, the drive current from the first rectifier circuit 6 that rectifies the control signal transmitted from the existing signal control system 10 is bypassed, and the other LED light emitting unit 5 is extinguished.

  Each of the output circuits of the small control terminal 21 that outputs the drive current corresponding to the control signal transmitted from the new signal control system 20 to the two LED units 31Y and 31G to be combined is output to the second rectifier circuit 7 respectively. Relay contacts YR and GR are provided in parallel in a one-line control system. In this case, as shown in the circuit diagram of FIG. 6, for example, when the relay contact YR is turned on in the state where the anti-rotation circuit 32 is not provided, the control signal is transmitted to the relay contact GR of the small control terminal and the first rectifier circuit 6. Even if the relay contact YGR of the existing signal control system 10 that outputs the signal is cut off, as shown by the dotted line in FIG. 6, the LED light is emitted from the output circuit of the small control terminal 21 from the second rectifier circuit 7 of the LED unit 31G. The drive current that has been half-wave rectified through the unit 5, the first rectifier circuit 6, the first rectifier circuit 6 of the LED unit 31Y, the combined display corresponding circuit 33, and the second rectifier circuit 7 wraps around the LED unit 31G. Even the LED light emitting unit 5 is lightly lit. The sneak current of the drive current is not a problem when the two signal units 31Y and 31G are always displayed in combination even in the new signal control system 20, but in the case of a simple display that lights the two LED units 31Y and 31G individually. It becomes inconvenient. In order to prevent this inconvenience, a wraparound prevention circuit 32 is provided in each LED unit 31Y, 31G.

  As described above, when the LED unit 31Y, 31G is provided with the anti-rotation circuit 32 and the composite display corresponding circuit 33, the circuit configuration of the LED units 31Y, 31G becomes complicated and expensive.

  The present invention improves the conventional LED traffic light, eliminates the need for an LED unit wraparound prevention circuit and a combined display corresponding circuit, improves reliability and economy, and normally performs single display and combined display control. An object of the present invention is to provide an LED traffic light that can be used.

The LED traffic light of the present invention is an LED traffic light having a connection means between an existing signal control system and a new signal control system, and has a small control terminal and a plurality of LED units, and the small control terminal is provided for each of the plurality of LED units. And a control signal transmitted from a new signal control system is output to the LED unit, and the LED unit includes an LED light emitting unit and other LED units. A first rectifier circuit that rectifies a control signal transmitted in series from an existing signal control system connected to one rectifier circuit and supplies a drive current to the LED light-emitting unit; and rectifies a control signal from the small control terminal circuit for supplying a second rectifier circuit for supplying a drive current to the LED light emitting part, a driving current from the first rectification circuit to the LED light emitting portion Te Provided, and having a diode for blocking the driving current from the second rectification circuit.

  This invention makes the output circuit of the small control terminal that outputs the control signal transmitted from the new signal control system to the LED unit a double-line control system, and supports the LED unit wraparound prevention circuit and the complex display corresponding to the conventional LED signal device. By eliminating the need for a circuit, it is possible to improve reliability and economy and to perform normal and complex display control normally.

It is a circuit diagram which shows the structure of the LED traffic light of this invention. It is a circuit diagram which shows the compound display state by the control signal from the existing signal control system. It is a circuit diagram which shows the simple display state by the control signal from a new signal control system. It is a circuit diagram which shows the structure of the conventional LED signal apparatus. It is a circuit diagram which shows the compound display state of the conventional LED signal apparatus. It is a circuit diagram which shows the single indication state when there is no wrap-around prevention circuit of the conventional LED traffic light.

  FIGS. 1A and 1B are circuit diagrams showing the configuration of the LED traffic light of the present invention. As shown in the figure, the LED traffic light 1 includes an existing signal control system 10 that is controlled by a voltage applied to a control line connected to a field device such as a traffic light and a small control provided in the field device such as a traffic light. It is connected to a new signal control system 20 that is controlled by control information sent to and received from a transmission line connected to the terminal, and blinks according to the voltage and current from the existing signal control system 10 and the control signal from the new signal control system 20. It has a small control terminal 2 and an LED unit 3. The small control terminal 2 is supplied with power via the isolation transformer 4, and multiplex information transmitted from the new signal control system 20 via the LAN cable is individualized and a control signal is output to the LED unit 3. As shown in FIG. 1B, the LED unit 3 is connected to the LED light emitting unit 5 and the existing signal control system 10 by individual wiring, and rectifies the control signal transmitted from the existing signal control system 10. A first rectifier circuit 6 that supplies a drive current to the LED light-emitting unit 5 and a second rectifier circuit 7 that rectifies a control signal from the small control terminal 2 and supplies the drive current to the LED light-emitting unit 5 are provided. The circuit that supplies the drive current from the first rectifier circuit 6 to the LED light emitting unit 5 is provided with a diode 8 that blocks the drive current from the second rectifier circuit 7. As shown in FIG. 2, the output circuit of the small control terminal 2 that outputs a drive current to the second rectifier circuit 7 of the LED unit 3 is provided with a pair of relay contacts R in a two-line control system.

  When a control signal is input from the existing signal control system 10 with the LED traffic light 1, the input control signal is full-wave rectified by the first rectifier circuit 6, and a drive current is supplied from the diode 8 to the LED light emitting unit 5. The light emitting unit 5 is turned on. Further, when a control signal is input from the new signal control system 20 and the relay contact R of the small control terminal 2 is turned on, an AC voltage is supplied to the second rectifier circuit 7 and full-wave rectification is performed by the second rectifier circuit 7. Then, a drive current is supplied to the LED light emitting unit 5 to light the LED light emitting unit 5.

  For example, when the LED signal 1 displays the Y display and the G display in combination, the first rectifier circuits 6 of the two LED units 3Y and 3G are connected in series as shown in the circuit diagram of FIG. Then, the control signal transmitted from the existing signal control system 10 is input, and the second rectifier circuit 7 of the LED unit 3Y is controlled via a pair of relay contacts YR provided in the output circuit of the small control terminal 2. The second rectifier circuit 7 of the LED unit 3G inputs a control signal via a pair of relay contacts GR provided in the output circuit of the small control terminal 2.

  When the LED signal device 1 having the two LED units 3Y and 3G is combined and displayed by the existing signal control system 10, the relay contact YGR of the existing signal control system 10 is made conductive to connect the LED units 3Y and 3G in series. An alternating voltage is supplied to the first rectifier circuit 6 that has been made. At this time, since no control signal is input from the new signal control system 20, the relay contacts YR and GR provided in the output circuit of the small control terminal 2 are in an OFF state. The AC voltage supplied to the first rectifier circuit 6 of the LED units 3Y, 3G is full-wave rectified by the first rectifier circuit 6, and as shown by the broken line in FIG. A drive current is supplied to the LED light-emitting portion 5 of the LED unit 3G to light it up, so that YG is displayed.

  When the control signal is input from the new signal control system 20 and the LED light emitting unit 5 of the LED unit 3Y is turned on, as shown in the circuit diagram of FIG. The relay contact YR of the terminal 2 is made conductive. The conduction of the relay contact YR supplies an AC voltage to the second rectifier circuit 7 of the LED unit 3Y, and full-wave rectification is performed by the second rectifier circuit 7 to supply a drive current to the LED light-emitting unit 5 to thereby supply the LED light-emitting unit. 5 is turned on to indicate Y display. At this time, the relay contact GR of the small control terminal 2 is in an OFF state, and the relay contact GR is a two-wire control system, so that the drive current does not flow into the second rectifier circuit 7 of the LED unit 3G. It is possible to reliably prevent the LED light emitting unit 5 of the LED unit 3G from being turned on.

  Further, when the composite display is performed by the control signal from the new signal control system 20, the relay contact YR and the relay contact GR of the small control terminal 2 are made conductive by the control signal from the new signal control system 20. The LED light emitting unit 5 and the LED light emitting unit 5 of the LED unit 3G are turned on to display YG.

1; LED traffic light; 2; Small control terminal; 3; LED unit; 4;
5; LED light emitting unit, 6; first rectifier circuit, 7; second rectifier circuit, 8; diode,
YR, GR; relay contact, YGR; relay contact, 10; existing signal control system,
20; New signal control system.

JP 2009-1114 A

Claims (1)

In an LED traffic light having a connection means between an existing signal control system and a new signal control system,
It has a small control terminal and a plurality of LED units,
The small control terminal has an output circuit of a two-line control system provided in parallel for each of the plurality of LED units , and outputs a control signal transmitted from a new signal control system to the LED unit,
The LED unit is connected in series to an LED light emitting unit and a first rectifier circuit of another LED unit, rectifies a control signal transmitted from an existing signal control system, and supplies a driving current to the LED light emitting unit. supply and rectifier circuit, a second rectifier circuit for supplying a control signal rectified by the driving current to the LED light emitting portion from the small control terminal, the drive current from the first rectification circuit to the LED light emitting portion of the And a diode that blocks a drive current from the second rectifier circuit.

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