WO2009119233A1 - 放電管点灯装置の同期運転システム及び放電管点灯装置並びに半導体集積回路 - Google Patents
放電管点灯装置の同期運転システム及び放電管点灯装置並びに半導体集積回路 Download PDFInfo
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- WO2009119233A1 WO2009119233A1 PCT/JP2009/053404 JP2009053404W WO2009119233A1 WO 2009119233 A1 WO2009119233 A1 WO 2009119233A1 JP 2009053404 W JP2009053404 W JP 2009053404W WO 2009119233 A1 WO2009119233 A1 WO 2009119233A1
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- signal
- discharge tube
- pulse signal
- tube lighting
- sawtooth
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters
- H05B41/282—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters
- H05B41/282—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices
- H05B41/2825—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices by means of a bridge converter in the final stage
- H05B41/2827—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices by means of a bridge converter in the final stage using specially adapted components in the load circuit, e.g. feed-back transformers, piezoelectric transformers; using specially adapted load circuit configurations
Definitions
- the present invention also relates to a semiconductor integrated circuit.
- a plurality of discharge tubes for example, cold cathode tubes (CCFLs)
- CCFLs cold cathode tubes
- FIG. 1 is a configuration diagram of a parallel operation system of related inverters.
- inverters of a plurality of discharge tubes are arranged close to each discharge tube and controlled in synchronization with the same phase.
- Each inverter constitutes each discharge tube lighting device.
- the mode circuit 201-2 of the main controller 200A When the system is turned on, the mode circuit 201-2 of the main controller 200A generates an H level mode output Vmode, and the oscillation circuit 201-1 is activated by the frequency determining capacitor 132, the frequency determining resistor 133, and the activation resistor 134.
- a PWM triangular wave signal CT and a clock signal CLK having a relatively high frequency are generated.
- the logic block 203 generates a synchronization signal TG based on the clock signal CLK.
- the sub controller ICs 200B to 200N are turned on almost simultaneously with the main controller 200A, but do not generate the PWM triangular wave signal CT, the clock signal CLK, and the synchronization signal TG because the frequency determining resistor 133 is not connected to the terminal 4P. .
- the sub controller ICs 200B to 200N generate PWM control signals based on the PWM triangular wave signal CT, the clock signal CLK, and the synchronization signal TG from the main controller 200A.
- the sub inverter operates in the same phase in synchronization with the main inverter having the main controller 200A, so that all inverters operate in the same phase in synchronization.
- the parallel operation system of the inverter shown in FIG. 1 sends a plurality of sawtooth waves and triangular waves of the oscillation circuit 201-1 of the main inverter having the main controller IC 200A to the sub inverters having the sub controller ICs 200B to 200N.
- Inverter oscillation frequency and phase are synchronized.
- the sawtooth wave or triangular wave of the oscillation circuit 201-1 of the main inverter and the rectangular wave signal synchronized with the oscillation circuit 201-1 are sent to the sub inverter to synchronize the oscillation frequency and phase of the plurality of inverters. ing.
- each discharge tube lighting device is disposed at both ends of each discharge tube.
- the present invention even when one or more discharge tube lighting devices are arranged at a long distance, synchronization of the discharge tube lighting device that stably and easily supplies positive and negative symmetric AC power to the load at the same frequency, the same phase, or the opposite phase.
- An operating system, a discharge tube lighting device, and a semiconductor integrated circuit can be provided.
- the synchronous operation system for a discharge tube lighting device shares each of the one or more discharge tube lighting devices with a common line.
- a synchronous operation system of a discharge tube lighting device that is connected and supplies alternating current power of the one or more discharge tube lighting devices to the one or more discharge tubes, wherein each of the one or more discharge tube lighting devices is a primary of a transformer
- a capacitor is connected to at least one of the winding and the secondary winding, and the discharge tube is connected to the output of the capacitor.
- the transformer is connected to both ends of a DC power source and the transformer in the resonance circuit.
- a plurality of switching elements for passing a current through the primary winding and the capacitor, a sawtooth oscillator for generating a sawtooth signal for PWM control of the plurality of switching elements, and a sawtooth signal from the sawtooth oscillator Based on A PWM comparator that outputs a PWM signal that controls the plurality of switching elements, and a synchronous pulse signal based on a pulse signal that transmits frequency information of the sawtooth signal from the sawtooth oscillator is output to the common line, and the common line
- a pulse synchronization circuit that synchronizes the oscillation frequency of the sawtooth wave signal from the sawtooth oscillator with the frequency of the synchronization pulse signal from the common line when the synchronization pulse signal is input from a line, and through the common line
- each of the one or more discharge tube lighting devices is commonly connected by a common line, and the AC power of the one or more discharge tube lighting devices is supplied.
- a discharge tube lighting device synchronous operation system that supplies one or more discharge tubes, wherein each of the one or more discharge tube lighting devices has at least one of a primary winding and a secondary winding of a transformer.
- the discharge tube lighting device is a resonant circuit in which a capacitor is connected to at least one of the primary winding and the secondary winding of the transformer, and a discharge tube is connected to the output thereof.
- a circuit, a plurality of switching elements connected to both ends of a DC power source and for passing a current to a primary winding of the transformer and the capacitor in the resonance circuit, and a saw for PWM control of the plurality of switching elements A sawtooth oscillator that generates a wave signal, a PWM comparator that outputs a PWM signal for controlling the plurality of switching elements based on the sawtooth signal from the sawtooth oscillator, and frequency information of the sawtooth signal from the sawtooth oscillator
- the sync pulse signal based on the pulse signal that transmits the signal is output to the outside, and when the sync pulse signal is input from the outside, the oscillation frequency of the sawtooth signal from the sawtooth oscillator is Characterized in that it comprises a pulse synchronization
- a semiconductor integrated circuit is a semiconductor integrated circuit for controlling a plurality of switching elements that turn on / off a power supplied to a load, and the plurality of switching elements are PWM-controlled.
- a sawtooth oscillator for generating a sawtooth wave signal
- a PWM comparator for outputting a PWM signal for controlling the plurality of switching elements based on the sawtooth wave signal from the sawtooth oscillator, and a sawtooth wave from the sawtooth oscillator
- a synchronization pulse signal based on a pulse signal that transmits frequency information of the signal is output to the outside, and when the synchronization pulse signal is input from the outside, the oscillation frequency of the sawtooth signal from the sawtooth oscillator is set to the synchronization pulse signal from the outside
- a pulse synchronization circuit that synchronizes with the frequency of the pulse.
- the discharge tube lighting device or the semiconductor integrated circuit outputs a pulse signal that transmits phase information of the PWM signal of the plurality of switching elements to the outside, and the pulse signal from the outside
- a signal comparator that outputs an out-of-phase detection signal when the phase of its own pulse signal is different from the phase of the input pulse signal, and an out-of-phase detection signal from the signal comparator.
- a restart circuit for generating a restart signal for resetting the pulse signal and restarting each discharge tube lighting device and outputting the restart signal to the outside.
- FIG. 3 is a timing chart of the out-of-phase detection operation of each discharge tube lighting device according to the first embodiment shown in FIG.
- FIG. 2 is a block diagram of the synchronous operation system of the discharge tube lighting device which concerns on Example 2 of this invention. It is a timing chart of the frequency synchronous operation
- the present invention synchronizes the oscillation frequency and phase of one or more discharge tube lighting devices by digital processing of transmission / reception of only a pulse signal, and further, one of one or more discharge tubes during startup or operation. If phase inversion occurs in any AC power, the pulse signal output from the sawtooth oscillator of all discharge tube lighting devices is reset and corrected to the same phase by digital processing of transmitting and receiving only the pulse signal.
- Example 1 FIG. 2 is a configuration diagram of the synchronous operation system of the discharge tube lighting device according to the first embodiment of the present invention. In FIG.
- one or more discharge tube lighting devices include control circuit units 1-1 to 1-3 (corresponding to the semiconductor integrated circuit of the present invention) including a controller IC, SW network 7- 1 to 7-3, resonance circuits 9-1 to 9-3, and discharge tubes 3-1 to 3-3 attached to the panel 30, and the discharge tubes 3-1 to 3-3 are turned on.
- a constant current determining resistor R2 is connected to each RF terminal of the control circuit units 1-1 to 1-3, a capacitor C2 is connected to each CF terminal, and a capacitor C6 is connected to each CS terminal. Yes.
- the TRI terminals of the control circuit units 1-1 to 1-3 are commonly connected by a common line 2a, and the PS terminals of the control circuit units 1-1 to 1-3 are commonly connected by a common line 2b.
- the PD terminals of the control circuit units 1-1 to 1-3 are connected in common by a common line 2c.
- a high-side P-type MOSFET Qp1 (referred to as P-type FET Qp1) and a low-side N-type MOSFET Qn1 (referred to as N-type FET Qn1) are provided between the DC power supply Vin and the ground.
- P-type FET Qp1 a high-side P-type MOSFET Qp1
- N-type FET Qn1 a low-side N-type MOSFET Qn1
- One series circuit is connected.
- a series circuit of the capacitor C3 and the primary winding P of the transformer T is connected between the connection point of the P-type FET Qp1 and the N-type FET Qn1 and the ground GND, and one end of the secondary winding S of the transformer T is connected to one end of the secondary winding S of the transformer T.
- a series circuit of a reactor Lr and a capacitor C4 is connected.
- the DC power source Vin is supplied to the source of the P-type FET Qp1, and the gate of the P-type FET Qp1 is connected to the DRV1 terminals of the control circuit units 1-1 to 1-3.
- the gate of the N-type FET Qn1 is connected to the DRV2 terminals of the control circuit units 1-1 to 1-3.
- One end of the secondary winding S of the transformer T is connected to one electrode of the discharge tubes 3-1 to 3-3 via the reactor Lr, and the other electrode of the discharge tubes 3-1 to 3-3 is a diode D1, It is connected to a tube current detection circuit comprising D2 and resistors R3 and R4.
- the tube current detection circuit detects the current flowing through the discharge tubes 3-1 to 3-3, and supplies a voltage proportional to the detected current via the FB (feedback) terminals of the control circuit units 1-1 to 1-3.
- the control circuit units 1-1 to 1-3 include a constant current source CC1, a constant current source CC2, a pulse synchronization circuit 11, a sawtooth oscillator 12, a signal comparator 13, a restart circuit 14, a software
- the circuit includes a start circuit 15, an error amplifier 16, a PWM comparator 17, an initialization circuit 18, a frequency divider 19, a NAND gate 20a, an AND gate 20b, and drivers 21a and 21b.
- the reference voltage PREG is generated in response to the power supply Vcc of the DC power supply Vin and is supplied to each part in the control circuit units 1-1 to 1-3.
- the constant current source CC1 is connected to one end of the constant current determining resistor R2 via the RF terminal, and supplies a constant current arbitrarily set by the constant current determining resistor R2.
- Sawtooth oscillator 12 via the CF pin is connected to one end of the capacitor C2, it was charged and discharged in the capacitor C2 by the constant current of the constant current source CC2, to generate a sawtooth signal V CF, as shown in FIG. 4, generating a rectangular clock CK based on the upper and lower limits of the sawtooth signal V CF.
- Clock CK as shown in FIG. 4, the rising period H level in synchronization with the sawtooth signal V CF, the falling period is L level of the pulse voltage waveform, sent to the frequency divider 19 and pulse synchronization circuit 11 It is done.
- Sawtooth oscillator 12 generates a sawtooth signal V CF of frequency determined by the constant current determination resistor R2 and the capacitor C2.
- the sawtooth oscillator 12 includes a constant current source CC2, resistors R6, R7, R8, FETs Q3, Q4, and a comparator 121.
- FET Q3 is charged capacitor C2 by the constant current of the constant current source CC2 When off, the voltage of the capacitor C2, i.e., the signal level of the sawtooth signal V CF rises.
- the inverting terminal of the comparator 121 is connected to the gate of the FET Q2 of the pulse synchronization circuit 11, one end of the resistor R6, and one end of the resistor R7, the other end of the resistor R6 is connected to the power supply PREG, and the other end of the resistor R7 is connected to the FET Q4. Connected to the drain.
- the non-inverting terminal of the comparator 121 is connected to one end of the capacitor C2, one end of the constant current source CC2, and one end of the resistor R8.
- the output terminal of the comparator 121 is connected to the gate of the FET Q3 and the gate of the FET Q4.
- the comparator 121 When the signal level of the sawtooth signal V CF exceeds the maximum value Vmax of the signal level of the clock CK, the comparator 121 outputs an H level, FET Q3 and FETQ4 is turned on. Then, the signal level of the clock CK decreases.
- the capacitor C2 is the signal level of the discharge to the sawtooth signal V CF decreases.
- the comparator 121 outputs a L level, FET Q3 and FETQ4 is turned off.
- a sawtooth signal (the sawtooth signal V CF in FIG. 4) having an upper limit value of voltage Vmax and a lower limit value of voltage Vmin is generated at the CF terminal, and a connection point between the resistor R6 and the resistor R7 is generated at the connection point.
- a clock CK is generated.
- the error amplifier 16 amplifies the error voltage between the voltage V FB from the tube current detection circuit input to the inverting terminal and the reference voltage E1 input to the non-inverting terminal, and outputs the error voltage output V FBOUT to the PWM comparator 17. Output to non-inverting terminal.
- the soft start circuit 15 charges the capacitor C6 connected to the CS terminal when the FET Q8 is OFF, and outputs the voltage VCS of the capacitor C6 to the non-inverting terminal of the PWM comparator 17.
- the PWM comparator 17 compares the error voltage output V FBOUT from the error amplifier 16 input to the non-inverting terminal and the voltage V CS from the soft start circuit 15, and the CF terminal to which the lower signal is input to the inverting terminal. in H level when the above sawtooth signal V CF from, and generates a pulse signal which becomes L level when less than the sawtooth signal V CF, and outputs to a NAND gate 20a and aND gate 20b.
- the frequency divider 19 has a flip-flop circuit 191 and AND gates 192 and 193, divides the pulse signal (clock CK) from the sawtooth oscillator 12, and the frequency-divided pulse signal passes through the AND gate 192. While outputting to the NAND gate 20a, a pulse signal obtained by inverting the divided pulse signal (which may have a predetermined dead time with respect to the divided pulse signal) is passed through the AND gate 193. To 20b.
- the NAND gate 20a calculates the NAND logic of the divided pulse signal from the frequency divider 19 and the signal from the PWM comparator 17, and outputs the first drive signal to the P-type FET Qp1 via the driver 21a and the DRV1 terminal.
- the AND gate 20b calculates an AND logic of the divided and inverted pulse signal from the frequency divider 19 and the signal from the PWM comparator 17, and outputs the second drive signal to the N-type FET Qn1 via the driver 21b and the DRV2 terminal. Output to.
- PWM comparator 17, NAND gate 20a, driver 21a is less than half the period of the sawtooth signal V CF, discharge tubes 3-1 to 3-3 with a pulse width corresponding to the current flowing through the discharge tube 3-1 to 3-3
- a first drive signal for driving the P-type FET Qp1 is generated so that a current flows through the first FET.
- the PWM comparator 17, the AND gate 20b, and the driver 21b have substantially the same pulse width as that of the first drive signal and a phase difference of about 180 degrees, and the discharge tubes 3-1 to 3 are in the opposite direction to the time when the first drive signal is generated.
- a second drive signal for driving the N-type FET Qn1 is generated so that a current flows through -3.
- the control circuit units 1-1 to 1-3 have the sawtooth wave by the first drive signal and the second drive signal having the same pulse width as the first drive signal and having a phase difference of about 180 degrees.
- the P-type FET Qp1 and the N-type FET Qn1 are alternately turned on / off at the frequency of the signal V CF to supply power to the discharge tubes 3-1 to 3-3 and to flow through the discharge tubes 3-1 to 3-3.
- the current can be controlled to a predetermined value.
- the pulse synchronization circuit 11 includes FETs Q1 and Q2, a resistor R5, inverters 111 and 116, NOR gates 112 and 114, and flip-flop circuits 113 and 115.
- the pulse synchronization circuit 11 generates the synchronization pulse signal SY as shown in FIG. 4 by turning on the FET Q2 by the L level of the pulse signal that is the clock CK that transmits the frequency information input from the sawtooth oscillator 12,
- the synchronization pulse signal SY is output from the terminal TRI to another control circuit unit via the common line 2a.
- the pulse synchronization circuit 11 inputs the synchronization pulse signal SY from another control circuit unit connected to the common line 2a to the TRI terminal.
- the H level of the synchronization pulse signal SY is inverted by the inverter 111 and the L level is input to one input terminal of the NOR gate 114.
- the NOR gate 112 outputs the H level when the clock CK (input of the inverter 116) is at the H level and the synchronization pulse signal SY is at the L level.
- the L level is output from the output terminal Q of the flip-flop circuit 113 to the NOR gate 114.
- the NOR gate 114 outputs an H level to the set terminal S of the flip-flop circuit 115. For this reason, since the FET Q1 is turned on by the H level from the output terminal Q of the flip-flop circuit 115, the signal level of the clock CK becomes the voltage Vmin.
- the signal level of the sawtooth signal V CF is larger than the voltage Vmin, the comparator 121 becomes H level, FET Q3 and the FETQ4 are turned on. For this reason, the capacitor C2 is discharged.
- the flip-flop circuit 113 is set, the flip-flop circuit 115 is reset, the FET Q1 is turned off, and charging of the capacitor C2 is started.
- the signal comparator 13 includes an inverter 131, a resistor R9, an FET Q5, and a NOR gate 132.
- the inverter 131 inverts the pulse signal from the AND gate 192 (H level and L level as phase information of the control signal), and outputs the inverted pulse signal VPDO to the FET Q5 and to the NOR gate 132.
- the NOR gate 132 compares the output VPDO of the inverter 131 with the pulse signal VPD input from another control circuit unit via the PD terminal. When both signal levels are L, the NOR gate 132 is 1 or more. Out of phase of the switching elements Qp1 and Qn1 generated between the discharge tube lighting devices is output, and an out-of-phase detection signal is output to the restart circuit.
- the restart circuit 14 includes a resistor R10, FETs Q6, Q7, Q8, and an inverter 141.
- the FET Q6 is turned on by the out-of-phase detection signal (H level) from the NOR gate 132 of the signal comparator 132 to generate the L level restart signal VPS, and the L level restart signal VPS is shared via the PS terminal.
- the signal is output to the line 2b to operate the restart circuit 14 of the other control circuit unit, and is output to its own inverter 141.
- the inverter 141 inverts the L level from the signal comparator 13 and outputs the H level.
- the FETs Q7 and Q8 are turned on by an H level restart signal from the inverter 141, and the initialization circuit 18 and the soft start circuit 15 are operated by the ON signal.
- the initialization circuit 18 has a resistor R12, a capacitor C7, and an inverter 181, and the soft start circuit 15 has a resistor R11 and a capacitor C6.
- the capacitor C7 is discharged, the voltage of the capacitor C7 is lowered, and the L level is output to the inverter 181.
- the inverter 181 outputs the H level to the reset terminal R of the flip-flop circuit 191 to forcibly reset the frequency divider 19.
- the soft start circuit 15 slowly charges the capacitor C6 with the resistor R11 after the capacitor C6 connected to the CS terminal is discharged by turning on the FET Q8.
- a pulse signal is input from the outside to the PD terminal of the signal comparator 13. Further, an inverted pulse signal VPDO is output from the inverter 131. Therefore, from time t1 to t6, the output of the NOR gate 132 becomes L level, and the FET Q6 is turned off. Therefore, the H level is output to the PS terminal, for FET Q7, FET Q8 is turned off, the voltage V CS of the capacitor C6 of the CS terminal becomes H level.
- the pulse signal VPDO becomes L level. That is, when the phase between the control circuit unit of the self and the other control circuit unit is shifted, the pulse signal from the outside and the pulse signal from the inverter 131 become L level, and the output of the NOR gate 132 becomes H level. Become. Therefore, since the FETQ6 is turned on, the signal V PS of PS terminal becomes L level, at the same time, the V PS also L levels of other control circuit part connected by the common line 2b. For this reason, all the control circuit units are restarted.
- the FET Q7 and FET Q8 are turned on by the H level from the inverter 141, and the capacitor C6 is discharged. As a result, the voltage V CS at the CS terminal decreases, and then the capacitor C6 is gradually charged after time t7.
- the voltage V CS of the capacitor C6 is input to the non-inverting terminal of the PWM comparator 17.
- the PWM comparator 17 compares the error voltage output V FBOUT from the error amplifier 16 input to the non-inverting terminal and the voltage V CS from the soft start circuit 15, and the CF terminal to which the lower signal is input to the inverting terminal. in H level when the above sawtooth signal V CF from, and generates a pulse signal which becomes L level when less than the sawtooth signal V CF, and outputs to a NAND gate 20a and aND gate 20b.
- a soft start operation is started in which the ON period of the drive signal for driving the plurality of switching elements Qp1 and Qn1 is gradually increased.
- the capacitor C2 when a synchronization pulse signal is input from the outside, the capacitor C2 is forcibly charged / discharged, and is synchronized with the synchronization pulse signal from the outside.
- Units 1-1 to 1-3 operate.
- the control circuit units 1-1 to 1-3 detect the out of phase via the PD terminal and detect the out of phase.
- the detected signal comparator 13 of the discharge tube lighting device operates.
- the restart circuit 14 of each discharge tube lighting device is operated via the PS terminal, each discharge tube lighting device is restarted and a soft start operation is started.
- FIG. 6 is a configuration diagram of a synchronous operation system of a discharge tube lighting device according to Embodiment 2 of the present invention.
- the synchronous operation system of the discharge tube lighting device according to the second embodiment shown in FIG. 6 is a control circuit unit 1 that sends an external synchronization pulse signal from the outside to the synchronous operation system of the discharge tube lighting device according to the first embodiment shown in FIG. The difference is that the signals are input to the TRI terminals -1 to 1-3.
- FIG. 7 is a timing chart of the frequency synchronization operation of each discharge tube lighting device of the second embodiment shown in FIG.
- Such a synchronous operation system of the discharge tube lighting device of the second embodiment operates in the same manner as the operation of the synchronous operation system of the discharge tube lighting device of the first embodiment, and the same effect is obtained.
- FIG. 8 is a configuration diagram of a synchronous operation system for a discharge tube lighting device according to Embodiment 3 of the present invention.
- discharge tube lighting devices 30a and 30b are provided on both sides of the panel 3 on which the discharge tubes 3-1 and 3-2 are mounted.
- the discharge tube lighting device 30a is a tube comprising control circuit units 1-1 to 1-2, SW networks 7-1 to 7-2, resonance circuits 9-1 to 9-2, diodes D1 and D2, and resistors R3 and R4. It has a current detection circuit.
- the output of the resonance circuit 9-1 is connected to one end of the discharge tube 3-1, and the output of the resonance circuit 9-2 is connected to one end of the discharge tube 3-2.
- the discharge tube lighting device 30b includes a control circuit unit 1-3 to 1-4, SW networks 7-3 to 7-4, resonance circuits 9-3 to 9-4, diodes D1 and D2, and resistors R3 and R4. It has a current detection circuit.
- the output of the resonance circuit 9-3 is connected to the other end of the discharge tube 3-1, and the output of the resonance circuit 9-4 is connected to the other end of the discharge tube 3-2.
- the TRI terminals of the control circuit units 1-1 to 1-4 are commonly connected by a common line 2a, and the PS terminals of the control circuit units 1-1 to 1-4 are commonly connected by a common line 2b.
- the PD terminals of the control circuit units 1-1 to 1-4 are commonly connected by a common line 2c.
- a secondary winding S of a transformer T connected to one end of the discharge tubes 3-1 to 3-2, and a secondary winding S of a transformer Ta connected to the other ends of the discharge tubes 3-1 to 3-2; Are different in polarity. Therefore, opposite phase voltages are applied to both ends of the discharge tubes 3-1 and 3-2.
- the synchronization pulse signals are mutually transmitted and received between the control circuit units 1-1 to 1-4 of the plurality of discharge tube lighting devices via the common line 2a.
- a voltage having the same frequency and an inverted phase is applied to both ends of each of the plurality of discharge tubes 3-1 to 3-2, so that the plurality of discharge tubes 3-1 to 3-2 are turned on. Can do.
- an external synchronization pulse signal may be input to the TRI terminals of the control circuit units 1-1 to 1-4 according to the third embodiment. In this case, the same effect as that of the third embodiment is obtained. can get.
- FIG. 9 is a configuration diagram of a discharge tube lighting device according to Embodiment 4 of the present invention.
- FIG. 10 is a configuration diagram of a control circuit unit provided in the discharge tube lighting device of the fourth embodiment shown in FIG. By connecting a plurality of discharge tube lighting devices shown in FIG. 9 in parallel, a synchronous operation system of the discharge tube lighting device can be configured.
- the discharge tube lighting device of the first to third embodiments uses the SW network 7 composed of the switching elements Qp1 and Qn1 having the half bridge configuration
- the discharge tube lighting device of the fourth embodiment is the switching device Qp1 having the full bridge configuration.
- Qn1, Qp2, and Qn2 are used, and the SW network 7a is used.
- a first series circuit of a P-type FET Qp1 and an N-type FET Qn1 is connected between the DC power source Vin and the ground.
- a second series circuit of a P-type FET Qp2 and an N-type FET Qn2 is connected between the DC power supply Vin and the ground.
- a series circuit of a capacitor C3 and a primary winding P of the transformer T is connected between a connection point between the P-type FET Qp1 and the N-type FET Qn1 and a connection point between the P-type FET Qp2 and the N-type FET Qn2.
- the DC power source Vin is supplied to the source of the P-type FET Qp1, and the gate of the P-type FET Qp1 is connected to the DRV1 terminal of the control circuit unit 1a.
- the gate of the N-type FET Qn1 is connected to the DRV3 terminal of the control circuit unit 1a.
- the DC power source Vin is supplied to the source of the P-type FET Qp2, and the gate of the P-type FET Qp2 is connected to the DRV2 terminal of the control circuit unit 1a.
- the gate of the N-type FET Qn2 is connected to the DRV4 terminal of the control circuit unit 1a.
- One end of the secondary winding S of the transformer T is connected to one electrode of the discharge tube 3 via a reactor Lr, and the other electrode of the discharge tube 3 is a tube current detection circuit comprising diodes D1, D2 and resistors R3, R4. It is connected to the.
- the control circuit unit 1a includes NAND gates 22a and 22b and drivers 21a to 21d.
- the NAND gate 22a calculates NAND logic between the output of the AND gate 192 and the output of the PWM comparator 17, and outputs NAND outputs to the drivers 21a and 21b.
- the NAND gate 22b calculates NAND logic between the output of the AND gate 193 and the output of the PWM comparator 17, and outputs the NAND output to the drivers 21c and 21d.
- the discharge tube lighting device according to the fourth embodiment configured as described above operates in the same manner as the discharge tube lighting device according to the first to third embodiments, and the same effect can be obtained.
- the pulse synchronization circuit 11 is configured to be synchronized by detecting the H level (rising edge) of the synchronization pulse signal (trigger signal).
- the synchronization circuit 11 may be configured to synchronize by detecting the L level (falling) of the trigger signal.
- the sawtooth oscillator 12 is used.
- a triangular wave oscillator that generates a triangular wave signal may be used.
- a dead time may be provided in order to prevent the DRV1 terminal output and the DRV3 terminal output and the DRV2 terminal output and the DRV4 terminal output shown in FIG. 9 from being simultaneously turned on.
- the plurality of discharge tubes may be at least one discharge tube such as CCFL or EEFL, or one in which a capacitor or the like and a discharge tube are connected in series.
- the frequency and phase are aligned at one end of each of the one or more discharge tubes by mutually transmitting and receiving synchronization pulse signals between the one or more discharge tube lighting devices via the common line. Since the voltage is applied, even when one or more discharge tube lighting devices are arranged at a long distance, AC power having positive and negative symmetry at the same frequency, the same phase, or the opposite phase can be stably and easily supplied to the load.
- AC power that is positive and negative symmetrical at the same frequency, same phase, or opposite phase can be stably and easily based on the synchronization pulse signal input from the outside of the system. Can supply load.
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Abstract
Description
前記課題を解決するために、本発明の第1の側面によれば、放電管点灯装置の同期運転システムは、1以上の放電管点灯装置の各々を共通線で共通接続し、前記1以上の放電管点灯装置の交流電力を1以上の放電管に供給する放電管点灯装置の同期運転システムであって、前記1以上の放電管点灯装置の各々は、トランスの一次巻線と二次巻線との少なくとも一方の巻線にコンデンサが接続され、その出力に前記放電管が接続された共振回路と、直流電源の両端に接続され且つ前記共振回路内の前記トランスの一次巻線と前記コンデンサとに電流を流すための複数のスイッチング素子と、前記複数のスイッチング素子をPWM制御するための鋸波信号を発生する鋸波発振器と、前記鋸波発振器からの鋸波信号に基づき前記複数のスイッチング素子を制御するPWM信号を出力するPWMコンパレータと、前記鋸波発振器からの鋸波信号の周波数情報を伝達するパルス信号に基づく同期パルス信号を前記共通線に出力し、前記共通線から前記同期パルス信号を入力したとき前記鋸波発振器からの鋸波信号の発振周波数を前記共通線からの前記同期パルス信号の周波数に同期させるパルス同期回路とを備え、前記共通線を介する前記1以上の放電管点灯装置間で前記同期パルス信号を相互に送受信することにより前記1以上の放電管の各々の一端に周波数と位相とを揃えた電圧を印加して前記1以上の放電管を点灯させることを特徴とする。
実施例1
図2は本発明の実施例1に係る放電管点灯装置の同期運転システムの構成図である。図2において、1以上の放電管点灯装置(この実施例では3つ)は、コントローラICからなる制御回路部1-1~1-3(本発明の半導体集積回路に対応)、SWネットワーク7-1~7-3、共振回路9-1~9-3、パネル30に併設された放電管3-1~3-3とを有し、放電管3-1~3-3を点灯させる。制御回路部1-1~1-3の各々のRF端子には定電流決定抵抗R2が接続され、各々のCF端子にはコンデンサC2が接続され、各々のCS端子にはコンデンサC6が接続されている。
パルス同期回路11は、FETQ1,Q2、抵抗R5、インバータ111,116、NORゲート112,114、フリップフロップ回路113,115を有している。
信号比較器13は、インバータ131、抵抗R9、FETQ5、NORゲート132を有している。インバータ131は、ANDゲート192からのパルス信号(制御信号の位相情報であるHレベル及びLレベル)を反転し、反転されたパルス信号VPDOをFETQ5に出力するとともにNORゲート132に出力する。
再起動回路14は、抵抗R10、FETQ6,Q7,Q8、インバータ141を有する。FETQ6は、信号比較器132のNORゲート132からの位相外れ検出信号(Hレベル)によりオンしてLレベルの再起動信号VPSを生成し、Lレベルの再起動信号VPSをPS端子を介して共通線2bに出力して他の制御回路部の再起動回路14を動作させるとともに、自己のインバータ141に出力する。
図6は本発明の実施例2に係る放電管点灯装置の同期運転システムの構成図である。図6に示す実施例2の放電管点灯装置の同期運転システムは、図2に示す実施例1の放電管点灯装置の同期運転システムに対して、外部からの外部同期パルス信号を制御回路部1-1~1-3の各TRI端子に入力した点が異なる。なお、図7は図6に示す実施例2の各々の放電管点灯装置の周波数同期動作のタイミングチャートである。
図8は本発明の実施例3に係る放電管点灯装置の同期運転システムの構成図である。図8において、放電管3-1~3-2を搭載したパネル3の両側には放電管点灯装置30a,30bが設けらている。
図9は本発明の実施例4に係る放電管点灯装置の構成図である。図10は図9に示す実施例4の放電管点灯装置に設けられた制御回路部の構成図である。図9に示す放電管点灯装置を複数個並列に接続して、放電管点灯装置の同期運転システムを構成することができる。
本発明によれば、共通線を介して1以上の放電管点灯装置間で同期パルス信号を相互に送受信することにより1以上の放電管の各々の一端に周波数と位相とを揃えた電圧を印加するので、1以上の放電管点灯装置が遠い距離に配置されても安定かつ容易に同周波数・同位相又は逆位相で正負対称の交流電力を負荷に供給できる。
本国際特許出願は米国指定に関し、2008年3月24日に出願された日本国特許出願第2008-076155(2008年3月24日出願)について米国特許法第119条(a)に基づく優先権の利益を援用し、当該開示内容を引用する。
Claims (12)
- 1以上の放電管点灯装置の各々を共通線で共通接続し、前記1以上の放電管点灯装置の交流電力を1以上の放電管に供給する放電管点灯装置の同期運転システムであって、
前記1以上の放電管点灯装置の各々は、
トランスの一次巻線と二次巻線との少なくとも一方の巻線にコンデンサが接続され、その出力に前記放電管が接続された共振回路と、
直流電源の両端に接続され且つ前記共振回路内の前記トランスの一次巻線と前記コンデンサとに電流を流すための複数のスイッチング素子と、
前記複数のスイッチング素子をPWM制御するための鋸波信号を発生する鋸波発振器と、
前記鋸波発振器からの鋸波信号に基づき前記複数のスイッチング素子を制御するPWM信号を出力するPWMコンパレータと、
前記鋸波発振器からの鋸波信号の周波数情報を伝達するパルス信号に基づく同期パルス信号を前記共通線に出力し、前記共通線から前記同期パルス信号を入力したとき前記鋸波発振器からの鋸波信号の発振周波数を前記共通線からの前記同期パルス信号の周波数に同期させるパルス同期回路とを備え、
前記共通線を介する前記1以上の放電管点灯装置間で前記同期パルス信号を相互に送受信することにより前記1以上の放電管の各々の一端に周波数と位相とを揃えた電圧を印加して前記1以上の放電管を点灯させることを特徴とする放電管点灯装置の同期運転システム。 - 1以上の放電管点灯装置の各々を共通線で共通接続し、前記1以上の放電管点灯装置の交流電力を1以上の放電管に供給する放電管点灯装置の同期運転システムであって、
前記1以上の放電管点灯装置の各々は、
トランスの一次巻線と二次巻線との少なくとも一方の巻線にコンデンサが接続され、その出力に前記放電管が接続された共振回路と、
直流電源の両端に接続され且つ前記共振回路内の前記トランスの一次巻線と前記コンデンサとに電流を流すための複数のスイッチング素子と、
前記複数のスイッチング素子をPWM制御するための鋸波信号を発生する鋸波発振器と、
前記鋸波発振器からの鋸波信号に基づき前記複数のスイッチング素子を制御するPWM信号を出力するPWMコンパレータと、
前記鋸波発振器からの鋸波信号の周波数情報を伝達するパルス信号に基づく同期パルス信号を前記共通線に出力し、前記共通線から前記同期パルス信号を入力したとき前記鋸波発振器からの鋸波信号の発振周波数を前記共通線からの前記同期パルス信号の周波数に同期させるパルス同期回路とを備え、
前記共通線を介する前記1以上の放電管点灯装置間で前記同期パルス信号を相互に送受信することにより前記1以上の放電管の各々の両端に、周波数を揃え且つ位相を反転させた電圧を印加して前記1以上の放電管を点灯させることを特徴とする放電管点灯装置の同期運転システム。 - 前記1以上の放電管点灯装置の各々は、
前記複数のスイッチング素子の前記PWM信号の位相情報を伝達するパルス信号を前記共通線に出力し、前記共通線から前記パルス信号を入力したとき入力された前記パルス信号の位相に対して自己のパルス信号の位相が異なる場合には位相外れ検出信号を出力する信号比較器と、
前記信号比較器からの位相外れ検出信号に基づき前記パルス信号をリセットして各放電管点灯装置を再起動させるための再起動信号を生成し前記共通線に出力する再起動回路と、
を備えることを特徴とする請求項1記載の放電管点灯装置の同期運転システム。 - 前記1以上の放電管点灯装置の各々は、
前記複数のスイッチング素子の前記PWM信号の位相情報を伝達するパルス信号を前記共通線に出力し、前記共通線から前記パルス信号を入力したとき入力された前記パルス信号の位相に対して自己のパルス信号の位相が異なる場合には位相外れ検出信号を出力する信号比較器と、
前記信号比較器からの位相外れ検出信号に基づき前記パルス信号をリセットして各放電管点灯装置を再起動させるための再起動信号を生成し前記共通線に出力する再起動回路と、
を備えることを特徴とする請求項2記載の放電管点灯装置の同期運転システム。 - 前記1以上の放電管点灯装置の各々は、
前記再起動回路からの再起動信号に基づき前記複数のスイッチング素子を駆動するための駆動信号のオン期間を徐々に増加するように制御するソフトスタート動作を行うソフトスタート回路を備えることを特徴とする請求項3記載の放電管点灯装置の同期運転システム。 - 前記1以上の放電管点灯装置の各々は、
前記再起動回路からの再起動信号に基づき前記複数のスイッチング素子を駆動するための駆動信号のオン期間を徐々に増加するように制御するソフトスタート動作を行うソフトスタート回路を備えることを特徴とする請求項4記載の放電管点灯装置の同期運転システム。 - トランスの一次巻線と二次巻線との少なくとも一方の巻線にコンデンサが接続され、その出力に放電管が接続された共振回路と、
直流電源の両端に接続され且つ前記共振回路内の前記トランスの一次巻線と前記コンデンサとに電流を流すための複数のスイッチング素子と、
前記複数のスイッチング素子をPWM制御するための鋸波信号を発生する鋸波発振器と、
前記鋸波発振器からの鋸波信号に基づき前記複数のスイッチング素子を制御するPWM信号を出力するPWMコンパレータと、
前記鋸波発振器からの鋸波信号の周波数情報を伝達するパルス信号に基づく同期パルス信号を外部に出力し、外部から前記同期パルス信号を入力したとき前記鋸波発振器からの鋸波信号の発振周波数を外部からの前記同期パルス信号の周波数に同期させるパルス同期回路と、
を備えることを特徴とする放電管点灯装置。 - 前記複数のスイッチング素子の前記PWM信号の位相情報を伝達するパルス信号を外部に出力し、外部から前記パルス信号を入力したとき入力された前記パルス信号の位相に対して自己のパルス信号の位相が異なる場合には位相外れ検出信号を出力する信号比較器と、
前記信号比較器からの位相外れ検出信号に基づき前記パルス信号をリセットして各放電管点灯装置を再起動させるための再起動信号を生成し外部に出力する再起動回路と、
を備えることを特徴とする請求項7記載の放電管点灯装置。 - 前記再起動回路からの再起動信号に基づき前記複数のスイッチング素子を駆動するための駆動信号のオン期間を徐々に増加するように制御するソフトスタート動作を行うソフトスタート回路を備えることを特徴とする請求項8記載の放電管点灯装置。
- 負荷に供給する電源をオン/オフする複数のスイッチング素子を制御するための半導体集積回路であって、
前記複数のスイッチング素子をPWM制御するための鋸波信号を発生する鋸波発振器と、
前記鋸波発振器からの鋸波信号に基づき前記複数のスイッチング素子を制御するPWM信号を出力するPWMコンパレータと、
前記鋸波発振器からの鋸波信号の周波数情報を伝達するパルス信号に基づく同期パルス信号を外部に出力し、外部から前記同期パルス信号を入力したとき前記鋸波発振器からの鋸波信号の発振周波数を外部からの前記同期パルス信号の周波数に同期させるパルス同期回路と、
を備えることを特徴とする半導体集積回路。 - 前記複数のスイッチング素子の前記PWM信号の位相情報を伝達するパルス信号を外部に出力し、外部から前記パルス信号を入力したとき入力された前記パルス信号の位相に対して自己のパルス信号の位相が異なる場合には位相外れ検出信号を出力する信号比較器と、
前記信号比較器からの位相外れ検出信号に基づき前記パルス信号をリセットして各放電管点灯装置を再起動させるための再起動信号を生成し外部に出力する再起動回路と、
を備えることを特徴とする請求項10記載の半導体集積回路。 - 前記再起動回路からの再起動信号に基づき前記複数のスイッチング素子を駆動するための駆動信号のオン期間を徐々に増加するように制御するソフトスタート動作を行うソフトスタート回路を備えることを特徴とする請求項11記載の半導体集積回路。
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| US12/934,397 US20110012527A1 (en) | 2008-03-24 | 2009-02-25 | Synchronous operation system for discharge lamp lighting apparatuses, discharge lamp lighting apparatus, and semiconductor integrated circuit thereof |
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| US6501234B2 (en) * | 2001-01-09 | 2002-12-31 | 02 Micro International Limited | Sequential burst mode activation circuit |
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| US7098612B2 (en) * | 2003-09-26 | 2006-08-29 | Beyond Innovation Technology Co., Ltd. | Frequency synchronization device for LCD lamps |
| JP4685602B2 (ja) * | 2005-11-16 | 2011-05-18 | ローム株式会社 | 三角波発生回路、それを用いたインバータ、発光装置、液晶テレビ |
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| JP2004242403A (ja) * | 2003-02-04 | 2004-08-26 | Rohm Co Ltd | 三角波信号の位相同期方法、及びそのシステム |
| JP2006032158A (ja) * | 2004-07-16 | 2006-02-02 | Minebea Co Ltd | 放電灯点灯装置 |
| JP2008067005A (ja) * | 2006-09-06 | 2008-03-21 | Rohm Co Ltd | 三角波発生回路、発生方法、それらを用いたインバータ、発光装置、液晶テレビ |
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