JP2008293836A - Discharge lamp lighting device and illumination device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device for light control capable of commonizing components for a first lamp and a second lamp of the same kinds of discharge lamps and also commonizing light control characteristics. <P>SOLUTION: The discharge lamp lighting device comprises a discharge lamp lighting means 1 for lighting by selectively mounting either of one discharge lamp FL1 with a designated rated lamp power or discharge lamps FL1 and FL2 in which the whole rated lamp power is two times the rated lamp power of one discharge and two lamps are connected with each other in series, a frequency control circuit 3 in which operation frequency of the discharge lamp lighting means 1 is changed to be a designated ratio of light control per each discharge lamp by a light control signal 4 entering from the outside, and a disconnection detection circuit 5 for detecting conditions of a filament between two discharge lamps FL1 and FL2 connected in series. The output signal of the disconnection detection circuit 5 enters the frequency control circuit 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a discharge lamp lighting device used for lighting a discharge lamp such as a fluorescent lamp, and a lighting fixture including the lighting device.

  In general, designing a discharge lamp lighting device requires a long development period and a large development cost. For this reason, it is required to reduce the cost by using the same parts as much as possible when using them for one lamp or for multiple lamps.

  As a first prior art, there is one disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 9-260078). According to this prior art, for example, it is possible to share parts for one lamp with a rated lamp power of 32 W and two lamps with a series configuration with a rated lamp power of 16 W. In other words, it is characterized by the possibility of sharing different types of discharge lamps, and is a technology that utilizes the fact that the equivalent impedance of lamps is the same for one and two lamps.

  As a second prior art, there is Patent Document 2 (Japanese Patent Laid-Open No. 2001-273939) that discloses that the same type of discharge lamp can be shared. According to this technology, the constant current characteristic of the lamp current is almost lost even if the equivalent impedance of the lamp is about 1: 2, because the discharge lamp is of the same type for one lamp and for two lamps in series configuration. There is a feature that the same kind of discharge lamp can be shared for one and two lamps.

  In recent years, many discharge lamp lighting devices have a function of detecting the breakage of the filament of the discharge lamp and stopping the operation of the discharge lamp lighting device from the viewpoint of safety. FIG. 13 shows a discharge lamp lighting device that can be used for one and two discharge lamps of the same type, and that has a function of stopping the operation of the discharge lamp lighting device by detecting breakage of the filament of the discharge lamp. FIG. In the circuit of FIG. 13, when the low pressure side filament and the high pressure side filament of the discharge lamps FL1 and FL2 in series are connected, or one discharge lamp is connected between the connectors CON1 and CON3, When the terminal is short-circuited through an appropriate resistor, the output of the comparator NL1 becomes High and the frequency control circuit 3 starts to oscillate. Further, when the low-pressure side filament or the high-pressure side filament of the two discharge lamps FL1 and FL2 is disconnected, or one discharge lamp is connected between the connectors CON1 and CON3, and the terminals of the connector CON2 are opened. In this case, since the direct current path for charging the capacitor C6 through the resistors R1, R2, and R3 is blocked by the capacitor C4, the output of the comparator NL1 becomes Low, and the frequency control circuit 3 stops oscillation.

  FIG. 14 is a perspective view showing a state in which each component of the above-described conventional discharge lamp lighting device is mounted on the printed circuit board 15 and stored in the case 16 and the connectors CON1, CON2, and CON3 are arranged.

According to this conventional example, it is possible to use the same type of discharge lamp for one lamp or two lamps depending on whether or not the connector CON2 is short-circuited outside the discharge lamp lighting device, and the disconnection of the discharge lamp filament is detected. Thus, it is possible to provide a discharge lamp lighting device with high safety in which parts that can stop the operation of the discharge lamp lighting device are made common.
JP-A-9-260078 Japanese Patent Laid-Open No. 2001-293991 (Embodiment 3)

  However, in the above conventional example, a problem occurs when the light output is changed by changing the light output of the discharge lamp. When the discharge lamps FL1 and FL2 are dimmed by changing the light output of the discharge lamps FL1 and FL2, a frequency dimming method that changes the switching frequency (oscillation frequency) of the switching elements Q1 and Q2 is often used. In this case, although not shown in FIG. 13, a dimming signal is applied to the frequency control circuit 3 from the outside, and the oscillation frequency of the frequency control circuit 3 is changed to change the impedance of the resonance circuit, thereby causing the discharge lamps FL1 and FL2 to The discharge lamps FL1 and FL2 are dimmed by changing the flowing lamp current.

  FIG. 15 is a diagram showing the relationship between the oscillation frequency when the discharge lamps FL1 and FL2 are dimmed and the lamp current flowing through the discharge lamps FL1 and FL2. The solid line indicates that for two lamps, the broken line indicates that for one lamp, the frequency f1 is the frequency at full lighting (FULL), and the frequency f2 is the frequency at the dimming lower limit (DIM) for two lamps. When dimming, the difference in impedance characteristics between the two lamps and one lamp becomes significant, so the difference between the lamp currents for the one and two lamps at the frequency f2 also increases, and the difference in the dimming characteristics is noticeable. Become.

  The present invention has been made in view of the above problems, and the object of the present invention is to make it possible to share parts for one lamp and two lamps of the same type of discharge lamp, and to share light control characteristics. It is to provide a dimming discharge lamp lighting device capable of performing the above.

  In order to solve the above-mentioned problem, the invention of claim 1 has one discharge lamp FL1 having a predetermined rated lamp power as shown in FIG. 3, or a total rated lamp power as shown in FIG. Is a discharge lamp lighting means 1 for selectively mounting one of the two discharge lamps FL1 and FL2 connected in series, which is twice the rated lamp power, and a control input from the outside. It comprises a control circuit (frequency control circuit 3) that changes the operating frequency of the discharge lamp lighting means 1 for each of the discharge lamps so as to become a predetermined dimming ratio for each of the discharge lamps. is there.

  According to a second aspect of the present invention, there is provided a detection means (disconnection detection circuit 5) for detecting a state of a filament between two discharge lamps FL1 and FL2 connected in series. Is output to the control circuit 3.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the discharge lamp lighting means 1 includes a plurality of sets of speeds at which wiring wires are inserted and connected to the lamp socket as shown in FIGS. A lamp socket having connecting terminals CON1, CON2, and CON3, and at least one fast connecting terminal CON2 of the plurality of sets of fast connecting terminals is connected to a filament between two discharge lamps FL1 and FL2 connected in series. 11b and 11c (FIG. 12) are selectively connected to either an electric wire for wiring or an impedance element (resistor R4).

  The invention of claim 4 is characterized in that, in the invention of claim 3, the impedance element (resistor R4) has a terminal structure (see FIG. 10) that can be attached to and detached from the quick-connection terminal CON2.

  Invention of Claim 5 is a lighting fixture (refer FIG. 11, FIG. 12) which equips a fixture main body with the discharge lamp lighting device in any one of Claims 1-4.

  According to the first aspect of the present invention, the same discharge lamp lighting means can be shared for one lamp and two series lamps, and a discharge lamp for dimming signals from the outside for one lamp and two series lamps. By varying the operating frequency of the lighting means, the same dimming ratio can be obtained for one lamp and two lamps in series.

  According to the second aspect of the present invention, it is possible to determine the use state for one lamp and the use state for two series lamps by using a circuit for detecting the state of the common side filament for the series two lamps.

  According to the invention of claim 3, the use state for one lamp and the use state for two series lamps are set depending on whether or not the impedance element is connected to the quick connection terminal to which the common side filament for series two lamps is connected. Is easy to do.

  According to the invention of claim 4, if an impedance element is attached to the quick connection terminal, it can be used for one lamp, and if the impedance element is removed from the quick connection terminal, it can be used for two series lamps.

(Embodiment 1)
FIG. 1 is a circuit diagram of Embodiment 1 of the present invention. The DC power source E is converted to a high frequency voltage by switching the switching elements Q1, Q2 via the drive circuit 2 with a high frequency signal oscillated by the frequency control circuit 3, and this high frequency voltage is converted into a resonance (current limiting) inductor L1, The first resonance capacitor C1 and the second resonance capacitor C2 are supplied to a resonance circuit composed of the discharge lamps FL1 and FL2. The second resonance capacitor C2 also functions as a DC cut capacitor.

  The resonance (current limiting) inductor L1 has three sets of secondary windings, and the filaments of the discharge lamp FL1 and the discharge lamp FL2 are provided with capacitors C3, C4, C5 and connectors CON1, CON2, CON3 for limiting the amount of current. Are connected to each other to form a filament preheating circuit. Each connector CON1, CON2, CON3 has a fast connection terminal structure.

  The discharge lamp lighting device includes independent disconnection detection circuits for detecting whether or not the filaments of the discharge lamps FL1 and FL2 using the filament preheating circuit are connected, and the outputs of the detection circuits are independent. Is input to the frequency control circuit 3. In the figure, only the disconnection detection circuit at the connection portion of the discharge lamps FL1 and FL2 is shown. The disconnection detection circuit 5 is constituted by a DC bias path including a DC power source E-resistor R1-low voltage side filament of the discharge lamp FL1 connected in series and a high voltage side filament-resistance R2-resistance R3 path of the discharge lamp FL2. When the detection voltage Vk is generated in the capacitor C6 connected in parallel with the resistor R3 and exceeds the reference voltage Vref1 of the comparator NL1, the output of the comparator NL becomes High, and the frequency control circuit 3 starts to oscillate. Here, the filament resistance value is approximately several Ω to several tens of Ω, and the resistors R1, R2, and R3 are configured with values of several tens of kΩ to several MΩ so as not to affect the resonance circuit.

On the other hand, if either the low-pressure side filament of the discharge lamp FL1 or the high-pressure side filament of the discharge lamp FL2 is disconnected, the capacitor C4 is interposed in the DC bias path, so the detection voltage Vk becomes 0V. Since the reference voltage Vref1 of the comparator NL1 is not exceeded, the output of the comparator NL1 becomes Low, and the frequency control circuit 3 stops oscillating.
The above operation is the same as the conventional example of FIG.

  The difference from the conventional example of FIG. 13 is that a second comparator NL2 is provided, the reference voltage Vref2 of which is lower than the reference voltage Vref1 of the first comparator NL1, and the outputs of the two comparators NL1 and NL2 are connected to the discrimination circuit 5a. This is the point input to the frequency control circuit 3 via

  FIG. 2 is a diagram showing the relationship between the reference voltages Vref1 and Vref2 and the detection voltage Vk when the filament is mounted. In the case of two lamps, a filament is connected to the connector CON2. At this time, the resistance values of the resistors R1, R2, and R3 are set so that the detection voltage Vk is higher than the reference voltage Vref1 of the first comparator NL1. If the filament is not connected, the detection voltage Vk becomes 0 V, and the oscillation stops when the voltage falls below the reference voltage Vref2 of the second comparator NL2.

  On the other hand, as shown in FIG. 3, in the case of one lamp, a resistor R4 is connected to the connector CON2 to change the detection voltage Vk. At this time, as shown in FIG. 4, the resistance value of the resistor R4 is set so that the detection voltage Vk is between the reference voltage Vref1 of the first comparator NL1 and the reference voltage Vref2 of the second comparator NL2.

  With this configuration, the signals input to the determination circuit 5a from the comparators NL1 and NL2 for the two lamps are High and High, respectively, and are input to the determination circuit 5a from the comparators NL1 and NL2 for the one lamp. The signals to be input are Low and High, respectively, and the signals input to the determination circuit 5a are different for two lamps and one lamp, so that the determination circuit 5a accurately determines whether the lamp is for two lamps or one lamp. Can do. The frequency control circuit 3 receives the determination result, that is, the output of the determination circuit 5a and the output of the dimming signal 4, so that the frequency control circuit 3 has a lamp current with a predetermined dimming ratio for two lamps and one lamp. The frequency can be changed.

  Specifically, referring to FIG. 15, at the output of the same dimming signal 4, for example, at the time of DIM, when the determination result of the determination circuit 5a is for two lamps, the frequency of the determination circuit 5a is set to f2. When the determination result is for one lamp, the frequency of the frequency control circuit 3 is changed so that the frequency becomes f3.

  As described above, according to the present embodiment, it is possible to provide a dimming discharge lamp lighting device capable of selectively using two lamps and one lamp only by connecting or not connecting the resistor R4.

(Embodiment 2)
FIG. 5 is a circuit diagram of Embodiment 2 of the present invention. The difference from the first embodiment is that in the first embodiment, the drive circuit 2 and the frequency control circuit 3 have a control circuit unit 7 which is a so-called HVIC (High Voltage IC), and the function of the determination circuit 5a is realized by the microcomputer 6. The point is that the output from the microcomputer 6 is transmitted to the frequency control circuit 3. The same components as those of the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  With this configuration, the dimming signal 4 and the discrimination results of the comparators NL1 and NL2 can be collectively processed by the microcomputer 6, so that the frequency control circuit 3 can be simplified and the drive circuit 2 and the HVIC can be used. The mounting area can be reduced. Further, if the disconnection detection circuit 5 and the microcomputer 6 are also made HVIC, the control circuit unit 7 can be further simplified, and further miniaturization can be realized.

(Embodiment 3)
FIG. 6 is a circuit diagram of Embodiment 3 of the present invention. This embodiment is an example in which the preheating current of the filaments of the discharge lamps FL1 and FL2, which are loads, is supplied from the preheating transformer T1 and the capacitor C7 in the first embodiment. That is, the secondary winding for filament preheating is not provided in the inductor L1, but the primary winding of the preheating transformer T1 is connected to both ends of the switching element Q2 via the capacitor C7, and this preheating transformer T1 is used for filament preheating. Secondary windings are provided. The same components as those of the second embodiment are denoted by the same reference numerals, and redundant description is omitted.

  According to the present embodiment, since the preheating current can be supplied using the output voltage of the inverter unit 1 constituted by the switching elements Q1 and Q2 as a power source, the preheating current can be set independently of the load-side resonance circuit.

(Embodiment 4)
FIG. 7 is a circuit diagram of Embodiment 4 of the present invention. The difference from the third embodiment is that, in the third embodiment, a parallel circuit of a switching element Q3 and a capacitor C8 is connected between the preheating transformer T1 and the ground line, and the switching element Q3 is controlled by the drive circuit 2. . The same components as those of the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  The switching element Q3 is driven by the drive circuit 2, but when the discharge lamp is in an unstable lighting discharge state (preheating / starting mode) as a driving signal, the switching element Q3 is turned on by outputting High so that the discharge lamp is in a stable lighting state. In the (lighting mode), control is performed so that the switching element Q3 is turned off by outputting Low. That is, when the discharge lamp is in an unstable lighting discharge state (preheating / starting mode), a preheating current is supplied by a series circuit of the capacitor C7 and the preheating transformer T1, and in a stable lighting state (lighting mode) of the discharge lamp, the capacitor C7 and the preheating transformer T1. The preheating current is supplied by the series circuit of the capacitor C8, and the circuit configuration is changed according to the state of the discharge lamp. In particular, the degree of freedom in setting the preheating current in the stable lighting state is increased.

  According to this embodiment, the filament current during stable lighting of the discharge lamp can be reduced, and the power consumption of the discharge lamp lighting device can be suppressed.

(Embodiment 5)
FIG. 8 is a circuit diagram of Embodiment 5 of the present invention. In the present embodiment, in the above-described fourth embodiment, the control circuit unit 7 includes the operational amplifier OP, and the dimming signal 4 is input to the non-inverting input terminal of the operational amplifier OP via the microcomputer 6. Further, a resistor Rs for current detection is inserted between the source of the switching element Q2 and the ground, a resistor R5 is connected between the non-ground side of the resistor Rs and the inverting input terminal of the operational amplifier OP, and the inverting input of the operational amplifier OP. A parallel circuit of a resistor R6 and a capacitor C9 is connected between the terminal and the output terminal of the operational amplifier OP, a resistor R8 and a capacitor C10 are connected to the frequency control circuit 3, and the non-ground side of the resistor R8 is connected to the resistor R7. This is connected to the output terminal of the operational amplifier OP through a series circuit of a diode D1. The same components as those of the fourth embodiment are denoted by the same reference numerals, and redundant description is omitted.

  The resistor Rs detects the switching current of the inverter unit 1 and is input to the inverting input terminal of the operational amplifier OP via the resistor R5. The integrating circuit is constituted by the resistor R5, the resistor R6, and the capacitor C9, and the response of the output voltage of the operational amplifier OP is set. A voltage V1 obtained by converting the dimming signal 4 into a direct current by the microcomputer 5 is input to the non-inverting input terminal of the OP.

  The dimming signal 4 is a rectangular wave signal (PWM signal), and the DC voltage V1 is changed according to the duty (ratio of the ON period in one cycle). In the present embodiment, the DC voltage V1 applied from the microcomputer 5 to the operational amplifier OP is set as shown in FIG. When the duty is reduced, that is, when the voltage V1 at the non-inverting input terminal of the operational amplifier OP increases, the output voltage of the operational amplifier OP increases so that the voltage at the inverting input terminal of the operational amplifier OP increases. On the other hand, when the duty is increased, that is, when the voltage V1 at the non-inverting input terminal of the operational amplifier OP decreases, the output voltage of the operational amplifier OP decreases so that the voltage at the inverting input terminal of the operational amplifier OP decreases. That is, the operational amplifier OP constitutes a feedback circuit having the average value of the switching current of the inverter unit 1 and the dimming signal 4 as inputs.

  Further, the frequency control circuit 3 has a DC voltage source (not shown), and the charge / discharge current set in the capacitor C10 and the resistor R8 connected to the outside, that is, the DC voltage source (not shown) flows out. The frequency is set by the current to be applied.

  Here, the operation of the operational amplifier OP and the frequency setting will be described. When the voltage at the output terminal of the operational amplifier OP decreases and the diode D1 is turned on, the current flowing out from the DC voltage source (not shown) of the frequency control circuit 3 increases and the oscillation frequency increases. On the other hand, when the voltage at the output terminal of the operational amplifier OP rises and the diode D1 is turned off, the current flowing out from the DC voltage source (not shown) of the frequency control circuit 3 becomes small and the frequency becomes low. That is, the frequency changes due to fluctuations in the output voltage of the operational amplifier OP.

  The above operation will be described with respect to the lamp current. When the duty of the dimming signal 4 is increased, the voltage V1 at the non-inverting input terminal of the operational amplifier OP is lowered, so that the output voltage of the operational amplifier OP is also lowered and the frequency is increased. Since the current is small, it can be dimmed.

  When the microcomputer 6 receives the output of the disconnection detection circuit 5 and determines that the microcomputer 6 is for two lamps, the DC voltage V1 output from the microcomputer 6 to the non-inverting input terminal of the operational amplifier OP with respect to the duty of the dimming signal 4 is indicated by the solid line in FIG. When the microcomputer 6 determines that it is for one lamp upon receiving the output of the disconnection detection circuit 5, the voltage V1 output from the microcomputer 6 to the non-inverting input terminal of the operational amplifier OP with respect to the duty of the dimming signal 4 Is output as indicated by the broken line in FIG. In the case of two lamps and one lamp, the resonance current of the inverter unit 1, that is, the input signal of the operational amplifier OP, the input voltage of the inverting input terminal is larger for the two lamps, and the relationship of the voltage V1 is as shown in FIG. Although it depends on the constant setting of the resonance circuit, the voltage difference between the two lamps and the one lamp DC voltage V1 becomes larger at the DIM time at the FULL time and at the DIM time.

  As described above, by changing the DC voltage V1 output to the non-inverting input terminal of the operational amplifier OP according to the determination result, the frequency can be changed so that the predetermined lamp currents for one lamp and two lamps can be obtained. Therefore, dimming can be performed so that the dimming ratio is almost the same for one and two lamps.

  As described above, according to the present embodiment, the dimming control circuit can be configured with a relatively simple configuration by using the operational amplifier OP.

(Embodiment 6)
In each of the embodiments described above, switching between one lamp and two lamps may be performed by the switching element 8 including the resistor R4 as illustrated in FIG. The switching element 8 has a terminal 9 that can be easily attached to a fast connection terminal (connector CON2), and a resistor R4 is connected between the terminals. The external appearance of the lighting device may be the same as the structure illustrated in FIG.

(Embodiment 7)
Further, each of the above embodiments may be used as a lighting device for a lighting fixture for one or two lamps as exemplified in FIGS. 11 and 12. In the figure, 10 is an instrument body, 11a and 11b are sockets for the discharge lamp FL1, 11c and 11d are sockets for the discharge lamp FL2, and 12 is a reflector. The appliance main body 10 incorporates the discharge lamp lighting device described in any of the above embodiments. When used in the lighting device for one lamp shown in FIG. 11, a switching element 8 having a built-in resistor R4 as shown in FIG. 10 is attached to a quick connection terminal (connector CON2), and sockets 11a and 11b are connected to connector CON1, respectively. It is used by connecting to CON3. When used in the two-lamp apparatus shown in FIG. 12, the switching element 8 is removed from the connector CON2, and the lamp socket 11b to which the filament on the common side of the two discharge lamps FL1 and FL2 connected in series is connected. , 11c are connected to the connector CON2, and the other sockets 11a, 11d are connected to the connectors CON1, CON3, respectively.

It is a circuit diagram of Embodiment 1 of the present invention. It is operation | movement explanatory drawing when Embodiment 1 of this invention is set for 2 light series use. It is a circuit diagram when Embodiment 1 of the present invention is set for one lamp. It is operation | movement explanatory drawing when Embodiment 1 of this invention is set for 1 lamp | ramp. It is a circuit diagram of Embodiment 2 of the present invention. It is a circuit diagram of Embodiment 3 of the present invention. It is a circuit diagram of Embodiment 4 of the present invention. It is a circuit diagram of Embodiment 5 of the present invention. It is operation | movement explanatory drawing of Embodiment 5 of this invention. It is a perspective view which shows the principal part structure of Embodiment 6 of this invention. It is a perspective view which shows the external appearance of the lighting fixture for 1 lamp | ramp of Embodiment 7 of this invention. It is a perspective view which shows the external appearance of the lighting fixture for 2 lights of Embodiment 7 of this invention. It is a circuit diagram of a conventional example. It is a perspective view which shows the external appearance of a prior art example. It is operation | movement explanatory drawing of a prior art example.

Explanation of symbols

1 Discharge lamp lighting means (inverter circuit)
3 Frequency control circuit 4 Dimming signal 5 Disconnection detection circuit FL1 Discharge lamp FL2 Discharge lamp R4 Resistor CON2 Fast connection terminal (connector)

Claims (5)

Either one discharge lamp with a predetermined rated lamp power or two discharge lamps connected in series, the total rated lamp power being twice the rated lamp power, are selectively mounted. And a control circuit for changing the operating frequency of the discharge lamp lighting means to a predetermined dimming ratio for each of the discharge lamps by a dimming signal input from the outside. A discharge lamp lighting device characterized by that. 2. The discharge device according to claim 1, further comprising a detection unit that detects a state of a filament between two discharge lamps connected in series, and an output signal of the detection unit is input to the control circuit. Electric light lighting device. The discharge lamp lighting means includes a plurality of sets of fast connection terminals to which wiring wires are inserted and connected to the lamp socket, and at least one of the plurality of sets of fast connection terminals is connected in series. The discharge lamp lighting device according to claim 1 or 2, wherein either a wire for wiring to a lamp socket to which a filament between two discharge lamps is connected or an impedance element is selectively connected. . 4. The discharge lamp lighting device according to claim 3, wherein the impedance element has a terminal structure that can be attached to and detached from the quick connection terminal. A lighting fixture comprising the discharge lamp lighting device according to any one of claims 1 to 4 in a fixture main body.

Images