JP2008059964A - Discharge lamp lighting device, and illumination device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device 21 capable of outputting information through a discharge lamp 13 outside, with little adverse effect on a light output of the discharge lamp 13. <P>SOLUTION: The device is provided with an inverter circuit 23 lighting the discharge lamp 13, and a preheating circuit for preheating filaments 13a of the discharge lamp 13. The filament preheating circuit 24 carries out variable control of the filament preheating currents supplied to the filaments 13a of the discharge lamp with the use of field effect transistors Q3, Q4 controlled at a control part 26. The field effect transistors Q3, Q4 are controlled in accordance with information signals by the control part 26 to vary the filament preheating currents, and an infrared-ray signal or a hot-wire signal is made outputted from the filaments 13a of the discharge lamp 13. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a discharge lamp lighting device for lighting a discharge lamp and outputting information to the outside through the discharge lamp, and an illumination device using the discharge lamp lighting device.

  2. Description of the Related Art Conventionally, some lighting devices have a function of transmitting information signals such as lighting states to the outside and notifying them. As a method of transmitting a signal from the lighting device to the outside, there is a method using wired or wireless. However, in the case of wired, it is necessary to construct a signal line, and in the case of wireless, the system becomes expensive. There's a problem.

Therefore, a method is known in which a signal is included in the light output of a discharge lamp so that wiring is not required and the system is configured at low cost. In this method, the signal is included in the light output of the discharge lamp by modulating the frequency applied to the switching element of the inverter circuit in accordance with a signal of information transmitted to the outside. The light output of the discharge lamp is received by a receiving terminal, and a signal included in the light output is received (for example, see Patent Document 1).
Japanese Patent Laying-Open No. 2005-176257 (page 6-7, FIG. 1)

  However, since the signal is included in the light output of the discharge lamp by modulating the frequency given to the switching element of the inverter circuit according to the information signal transmitted to the outside, the light output of the discharge lamp is affected, There is a problem that the light output of the discharge lamp flickers.

  The present invention has been made in view of the above points, and has a small influence on the light output of the discharge lamp, and can discharge information to the outside through the discharge lamp, and illumination using the discharge lamp lighting apparatus An object is to provide an apparatus.

  The discharge lamp lighting device according to claim 1 is an inverter circuit for lighting a discharge lamp having a filament; a filament preheating circuit that variably controls a filament preheating current supplied to the filament of the discharge lamp; and an information signal to be transmitted to the outside And a controller for variably controlling the filament preheating current by the filament preheating circuit.

  Examples of the discharge lamp include a straight tube fluorescent lamp. The inverter circuit converts the output of the DC power source into a high-frequency AC power source, for example, by turning on and off the switching element. The filament preheating circuit variably controls the filament preheating current using, for example, a switching element.

  Then, the filament preheating circuit variably controls the filament preheating current according to the information signal transmitted to the outside, for example, so as to increase or decrease the intensity, thereby outputting the infrared ray signal or the heat ray signal from the filament of the discharge lamp as a receiving terminal. The light is received by an infrared sensor or a heat ray sensor, and a signal is received.

  According to a second aspect of the present invention, in the discharge lamp lighting device according to the first aspect, the filament preheating circuit includes a switching element that variably controls the filament preheating current under the control of the control unit. As the switching element, for example, a field effect transistor having a switching function and an amplification function is used.

  The discharge lamp lighting device according to claim 3 is the discharge lamp lighting device according to claim 1 or 2, wherein the control unit outputs a signal during lighting of the discharge lamp except during preheating before starting the discharge lamp. . By not outputting a signal during preheating before starting, excessive preheating or underpreheating of the filament of the discharge lamp during preheating before starting is prevented. This is because preheating before start-up may shorten the service life if the amount is not appropriate.

  An illumination device according to a fourth aspect includes an appliance main body on which the discharge lamp is disposed; and the discharge lamp lighting device according to any one of the first to third aspects for lighting the discharge lamp.

  According to the discharge lamp lighting device of the first aspect, the filament preheating current is varied by the filament preheating circuit in accordance with the information signal transmitted to the outside, thereby modulating the frequency of the inverter circuit to obtain the light output of the discharge lamp. Compared with the case where a signal is included, there is less influence on the light output of the discharge lamp, and information can be output to the outside through the discharge lamp.

  According to the discharge lamp lighting device of the second aspect, in addition to the effect of the discharge lamp lighting device of the first aspect, by including a switching element that variably controls the filament preheating current by the control of the control unit, The filament preheating current can be appropriately supplied to the filament, and the filament preheating current can be arbitrarily changed according to the signal.

  According to the discharge lamp lighting device according to claim 3, in addition to the effect of the discharge lamp lighting device according to claim 1 or 2, a signal is output during lighting of the discharge lamp, and no signal is output during preheating before starting. Thus, it is possible to prevent preheating or preheating of the filament of the discharge lamp at the time of preheating before starting, and to appropriately perform preheating before starting.

  According to the illumination device of the fourth aspect, by using the discharge lamp lighting device according to any one of the first to third aspects, the light output of the discharge lamp is less affected, and information can be output to the outside through the discharge lamp.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  1 is a circuit diagram of a discharge lamp lighting device, FIG. 2 is a perspective view of a lighting device using the discharge lamp lighting device, and FIG. 3 is a block diagram of a receiving terminal that receives a signal output from the discharge lamp of the lighting device. .

  As shown in FIG. 2, the lighting device includes an instrument body 11, sockets 12 are disposed at both ends of the instrument body 11, and a discharge lamp 13 such as a straight tube fluorescent lamp is electrically connected between the sockets 12. And mechanically detachably attached. A discharge lamp lighting device for lighting the discharge lamp 13 is disposed in the appliance main body 11.

  As shown in FIG. 1, in a discharge lamp lighting device 21, an inverter circuit 23 and a filament preheating circuit 24 are connected in parallel to a DC power source 22 obtained by rectifying an AC power source.

  The inverter circuit 23 has a field effect transistor Q1 and a field effect transistor Q2 as switching elements connected in series. The field effect transistor Q1 and the field effect transistor Q2 are alternately turned on and off by a control signal from the drive circuit 25. Is done.

  A series circuit of a DC cut capacitor C1, a choke coil L1, and a resonance capacitor C2 is connected from the connection point between the field effect transistor Q1 and the field effect transistor Q2, and each end of the discharge lamp 13 is connected to both ends of the capacitor C2. One end of the filament 13a is connected, and the choke coil L1 and the capacitor C2 constitute a resonance circuit.

  The filament preheating circuit 24 includes a field effect transistor Q3 and a field effect transistor Q4 as switching elements connected in series. The field effect transistor Q1 and the field effect transistor Q2 are alternately switched by a control signal from the control unit 26. ON / OFF control.

  A series circuit of a DC cut capacitor C3 and a primary coil Tr1 of a filament preheating transformer Tr is connected from a connection point between the field effect transistor Q3 and the field effect transistor Q4, and a discharge lamp 13 is connected to the secondary coil Tr2 of the filament preheating transformer Tr. The filaments 13a at both ends are connected.

  The control unit 26 controls the preheating of the filament 13a of the discharge lamp 13 including preheating before starting, and increases or decreases the filament preheating current by the filament preheating circuit 24 according to information signals transmitted to the outside such as a lighting state. Thus, it has a function of variably controlling. The control unit 26 outputs a signal during the lighting of the discharge lamp 13 except during preheating before starting the discharge lamp 13.

  FIG. 3 shows a receiving terminal 31 that receives a signal output from the discharge lamp 13 of the lighting device. The receiving terminal 31 includes a sensor 32 such as an infrared sensor or a heat ray sensor. The sensor 32 receives an infrared signal or a heat ray signal output from the filament 13a of the discharge lamp 13 by changing the filament current, and lights up from the received signal. Get information such as status.

  Then, by turning on the DC power supply 22 of the discharge lamp lighting device 21, the control unit 26 of the filament preheating circuit 24 controls the field effect transistors Q3 and Q4, and the filament preheating current is discharged through the filament preheating transformer Tr. 13 is supplied to the filament 13a, and the filament 13a of the discharge lamp 13 is preheated.

  The field effect transistors Q1 and Q2 are controlled by the drive circuit 25 of the inverter circuit 23, the high frequency voltage is applied to the resonance circuit of the choke coil L1 and the capacitor C2, and the filament 13a is preheated by the filament preheating circuit 24. When a resonance voltage is applied and the resonance voltage increases to a voltage necessary for starting the discharge lamp 13, the discharge lamp 13 starts to discharge and lights up.

  In addition, during the lighting of the discharge lamp 13, the control unit 26 controls the field effect transistors Q3 and Q4 according to the information signal to increase or decrease the filament preheating current in order to output information such as the lighting state. And output from the filament 13a of the discharge lamp 13 as an infrared signal or a heat ray signal.

  An infrared signal or a heat ray signal output from the filament 13a of the discharge lamp 13 is received by the sensor 32 of the receiving terminal 31, and information such as a lighting state is acquired from the received signal.

  In this way, the frequency of the inverter circuit 23 is modulated as in the past by changing the filament preheating current to be increased or decreased by the filament preheating circuit 24 according to the information signal transmitted from the discharge lamp lighting device 21 to the outside. As compared with the case where a signal is included in the light output of the discharge lamp 13, the influence on the light output of the discharge lamp 13 is small, and information can be output to the outside through the discharge lamp 13.

  In addition, by providing the field effect transistor Q3 and the field effect transistor Q4 as switching elements that variably control the filament preheating current under the control of the control unit 26, the filament preheating current can be appropriately supplied to the filament 13a of the discharge lamp 13, and the filament preheating The current can be varied according to the signal.

  In addition, the control unit 26 outputs a signal while the discharge lamp 13 is lit, and does not output a signal during preheating before starting, thereby preventing overheating or underheating of the filament 13a of the discharge lamp 13 during preheating before starting. Therefore, preheating before starting can be performed appropriately.

It is a circuit diagram of a discharge lamp lighting device showing an embodiment of the present invention. It is a perspective view of the illuminating device using a discharge lamp lighting device same as the above. It is a block diagram of the receiving terminal which receives the signal output from the discharge lamp of an illuminating device same as the above.

Explanation of symbols

11 Instrument body
13 Discharge lamp
13a filament
21 Discharge lamp lighting device
23 Inverter circuit
24 Filament preheating circuit
26 Control unit
Q3, Q4 Field-effect transistors as switching elements

Claims (4)

An inverter circuit for lighting a discharge lamp having a filament;
A filament preheating circuit for variably controlling the filament preheating current supplied to the filament of the discharge lamp;
A control unit that variably controls the filament preheating current by the filament preheating circuit in accordance with a signal of information transmitted to the outside;
A discharge lamp lighting device comprising: The discharge lamp lighting device according to claim 1, wherein the filament preheating circuit includes a switching element that variably controls the filament preheating current under the control of the control unit. The discharge lamp lighting device according to claim 1 or 2, wherein the control unit outputs a signal during lighting of the discharge lamp except during preheating before starting the discharge lamp. An instrument body in which the discharge lamp is disposed;
A discharge lamp lighting device according to any one of claims 1 to 3 for lighting a discharge lamp;
An illumination device comprising:

Images